As vets, we’re often asked about how often a dog guardian should worm their dog. 

Worming can be an annoying and difficult process for some dogs, though for many, it is as simple as a small pipette of liquid that is squeezed out onto their shoulder blades! 

In this article, our Chief Veterinarian and Omni Co-Founder, Dr. Guy MRCVS, explains how often you ought to de-worm your dog. 

How Often Should You Worm Your Dog? 

The frequency with which you should apply worming treatment to your dog varies based on a number of factors. 

How Your Dog’s Age Impacts Worming Frequency 

Younger dogs, particularly puppies, need to have worming treatment far more frequently than most dogs. 

Puppies can pick up worms either from their mother through nursing or else from the environment or other dogs they may meet, as they have a less well-developed immune system at that age. 

Similarly, older dogs who have weakened immune systems may also require more worming more frequently. 

  • Puppies: For puppies, you should be worming them from the age of 2 weeks every 2 weeks until they are around 3 months old,then every month until 6 months old. Follow the product instructions and your vet’s recommendations for more exact guidance. 
  • Adult dogs: For adult dogs, you should be worming them every 3-6 months, depending on the product guidance and your vet’s recommendations. 
  • Senior dogs: For elderly dogs, the standard guidance for adult dogs still applies, but you may want to worm them more frequently if you notice they have a weakened immune system or if your vet recommends you do so.  
  • How Your Dog’s Weight Impacts Worming Frequency 

    Most worming medication has guidance on the back that shows how much dosage to give dogs of different sizes. 

    Because worming medication works by entering the bloodstream and transporting the medication around the body, larger-bodied dogs need a stronger dosage to successfully eradicate the worms from their bodies than smaller dogs do. 

  • Under-dosing can mean that you are not effectively eliminating all the parasitic worms. 
  • Overdosing can cause gastrointestinal issues like vomiting, diarrhoea, or even toxic reactions. 
  • It is therefore very important that you account for your dog’s weight when considering how strong a dose to give them when treating worms. 

    Our vets also recommend that you weigh your puppy frequently to not only monitor their healthy growth as they develop into full-size dogs, but also so you can apply the correct dosage of worming medication every two to three weeks throughout the early months of their lives. 

    How Your Local Area Impacts How Often You Should Worm 

    Your local vet is the best person to talk to about this. 

    Some areas are more high-risk than others, and this particularly affects dogs who scavenge more. More scavenging means more chance of coming across parasitic worms in the “wild” - even if that’s just in your neighbour’s bins!

    In a rural area, you may find that you are at higher risk of worm infestations from farming or gardening waste. More wildlife (such as foxes, rodents and deer) can also mean more worms lurking in the undergrowth ready for your dog to accidentally eat. 

    Dogs in rural areas therefore may need more frequent worming. 

    Dogs in urban areas may still need more worming if they often (too many frequentlies) visit the dog park or areas with a high concentration of dogs, as they can easily pass worms between each other. This is also true for dogs who live in urban environments but frequently travel out of town. 

    As well as this, you should consider whether you live in a warm, humid climate or a cold, dry one. Warm and humid climates are more worm-friendly, allowing parasites to thrive in nutrient-rich soils, meaning you may want to apply worming treatment to your dog more frequently than if you lived in a cold, dry environment where worms struggle to survive. 

    If Your Dog Spends Time With Elderly People or Children… 

    Then you may want to worm more frequently. 

    The risk here isn’t purely to your dog, as there is a risk of your dog giving worms to people with weakened immune systems, as well as worms going the other way! 

    In this case, you may want to be more vigilant with worming your dog more regularly - within the limits of the product you are using and your vet’s advice - in order to ensure worms and worm eggs aren’t being unwittingly passed around the house. 

    How Does Worming Treatment Work for Dogs? 


    Many worming treatments are either a liquid that you place into the space between a dog’s shoulder blades or a tablet that they eat (usually alongside food or a treat). 


    In either case, the medication is usually absorbed into their bloodstream and transported through their entire bodies. 


    When the active ingredients of the medication encounter a parasitic worm, they act in such a way as to either kill or inactivate the parasite, causing them to get excreted as waste. 


    Why Are There Worms In My Dog’s Poop?


    Usually this is because you have given your dog worming treatment and you are seeing the worms get excreted. This is nothing to worry about - just a case of the medication doing its job! 


    However, if you have not applied any medication to your dog, and nor has your vet, then it is a sign that your dog has worms and you should consult with a vet to find out the best course of action. 


    In any case, make sure to pick up your dog’s poops quickly and dispose of them hygienically in order to prevent worms from spreading around your house or garden. 

    When to Contact a Vet

    You should contact a vet if:

    • Your dog is vomiting, having diarrhoea, or showing symptoms of toxicity after having had a worming treatment. 
    • Your dog is expressing a large quantity of worms in their stools, especially if they have not received worming treatment. 
    • Your dog is losing weight rapidly despite eating enough food. 

    If you’re worried about your dog’s health, it’s always best to get professional advice. Book a free consultation with our vet team at Omni for expert guidance on worming treatment plans.

    Thoughts from Dr Guy MRCVS


    As dog lovers and guardians, it’s natural to worry about our furry friends, especially when they display abnormal symptoms that can’t be easily explained. That’s why, when I founded Omni, I knew that I wanted to keep vet consultation free and accessible at the heart of the business. 


    If you’re understandably worried about your dog, but you don’t think you need to take them to the vets urgently, I highly recommend getting some friendly, professional advice from one of our team. 


    Book your appointment here

    Got a question for the Ask a Vet team?


    Submit your question via email to woof@omni.pet. We’ll get back to you as soon as we can, and, if suitable, post the response here to help others, too! 


    Disclaimer: Our Video Vet Consultation service is limited because we are unable to perform a full physical examination of your pet. Our vets have no responsibility for the examination or other medical services provided during the Consultation.


    Please note that our Video Vet Consultations do not replace traditional veterinary care, but can provide additional support.  Based on the information you have provided and the symptoms you have described, the Vet will give you advice and an ongoing plan. Without a physical examination, we cannot provide a definitive diagnosis. If you are worried that your dog's condition is worsening, or you need additional support, please schedule another consultation, or see your registered vet.

    FAQs

    But aren’t dog’s carnivores?

    Dogs are in fact nutritional omnivores as demonstrated by a robust scientific study published in the reputable journal Nature (1,2) in which it was shown that they have 30 copies of the AMY2B gene responsible for digesting plant-based foods.

    They have also evolved relatively long intestines (21) (almost as long as humans) and relatively flat surfaces on their molars (31, 22) which they use for digesting and chewing a whole range of foods.

    The common misconception that dogs are carnivores probably arises from the fact that they are classified in the order Carnivora but so are plenty of other species like bears, skunks, racoons who are omnivores and even the giant panda who thrives on a plant-based diet (20).

    Is plant protein digestible to dogs?

    Absolutely yes, studies which have looked at how much protein dogs can absorb from plant-based and fungi-based foods like soya and yeast demonstrated over 75% digestibility which is on par with meat-based foods (23, 24, 34, 35 & 25).

    Both these protein sources also contain all 10 essential amino acids (36, 37) that dogs need to thrive.

    Isn't there too much fibre in plant-based food?

    The average amount of fibre in a commercial dog food diet is between 2-4%. omni’s plant-powered recipe has a fibre content of 3% which is on par with meat- based diets.

    In our survey with over 200 dog owners, 100% reported that their dog’s stool consistency was either ‘normal’ or ‘perfect’ and there were no reports of any digestive upsets (data on file).

    Can I mix omni with other meat-based diets?

    We are proud that our recipes are nutritionally complete and so include everything your dog needs to thrive. This means omni can be fed as a sole ration. We also fully support a 'flexitarian approach' like meat free lunches or using omni as a mixer.

    Every little helps to bring some of the health and environmental benefits of plant-power to meal times. Mixing omni with meat/fish will help to add variety into your dog’s diet whilst adding in healthy ingredients with a relatively low carbon footprint.

    Can plant-based food provide the essential fatty acids dogs need?

    All the essential fats and oils that dogs need, including omegas 3 and 6 are found in a variety of both meat and plant-based foods (31, 28).

    omni’s recipe is rich in plant-based sources of these nutrients so your dog will get all the essentials they need.

    I hear a lot about feeding raw meat, isn’t that better?

    Feeding raw meat to dogs has become a very popular trend in recent years, but most vets will warn against this practise. This is because the cooking process is vital to help kill off dangerous bacteria like E coli, Salmonella and Campylobacter (9) that have necessitated several food recalls from the market and caused serious illness and even death in both dogs and their owners (40, 41, & 42).

    There are also several worms and parasites that are only killed off when raw meat is cooked. Dogs are dogs, not wolves and thanks to their domestication over thousands of years, thankfully don’t need to hunt to get their grub nor do they need to eat raw meat, it's just not worth the risk.

    References

    1. Buff P.R., Carter R.A., Bauer J.E., Kersey J.N. (2014) Natural pet food: A review of natural diets and their impact on canine and feline physiology. J. Anim. Sci.;92:3781–3791. doi: 10.2527/jas.2014-7789


    2. Axelsson E., Ratnakumar A., Arendt M.L., Maqbool K., Webster M.T., Perloski M., Liberg O., Arnemo J.M., Hedhammar A., Lindblad-Toh K. (2013) The genomic signature of dog domestication reveals adaptation to a starch-rich diet. Nature; 495:360–364. doi: 10.1038/nature11837


    3. The European Pet Food Industry (FEDIAF) Nutrition [ Accessed on 3 June 2021] Available online: http://www.fediaf.org/self-regulation/nutrition/


    4. Gentle World Good Nutrition for Healthy Vegan Dogs [Accessed on 3 June 2021] Available online: http://www.webcitation.org/6ineIZmNQ


    5. Peden J. (1999) Vegetarian Cats & Dogs. 3rd ed. Harbingers of a New Age; Troy, MT, USA


    6. Semp P.-G. (2014) Master’s Thesis. Veterinary University of Vienna; Vienna, Austria: Vegan Nutrition of Dogs and Cats


    7. Brown W.Y., Vanselow B.A., Redman A.J., Pluske J.R. (2009) An experimental meat-free diet maintained haematological characteristics in sprint-racing sled dogs. Br. J. Nutr.;102:1318–1323. doi: 10.1017/S0007114509389254


    8. People for the Ethical Treatment of Animals (PETA) Dog Health Survey. [Accessed on 3 June 2021]


    9. Marks S.L., Rankin S.C., Byrne B.A., Weese J.S. (2011) Enteropathogenic bacteria in dogs and cats: Diagnosis, epidemology, treatment, and control. J. Vet. Intern. Med.;25:1195–1208. doi:


    10. Carrión P.A., Thompson L.J., Motarjemi Y., Lelieveld H., (2014) Food Safety Management: A Practical Guide for the Food Industry. Academic Press; London, UK:. pp. 379–395


    11. Knight, A. and Leitsberger, M. (2016) Vegetarian versus meat-based diets for companion animals. Animals 6, 57.


    12. Boyer C.I., Jr., Andrews E.J., deLahunta A., Bache C.A., Gutenman W.H., Lisk D.J. (1978) Accumulation of mercury and selenium in tissues of kittens fed commercial cat food. Cornell Vet.;68:365–374.


    13. Anonymous. Your Pet’s Dog Food Could Be Dangerous. [Accessed on 8 December 2014] Available online: http://www.wavy.com/Global/story.asp?S=1018127&nav=23iiCT4S.


    14. Porecca K. (1995) Personal letter to James Peden re: Interview of University of California (Davis), North Carolina State University, and University of Guelph Researchers investigating the connection between dilated cardiomyopathy and diet


    15. Perry T. What’s Really for Dinner? [Accessed on 7 July 2016] Available online: http://www.webcitation.org/6ipEL5YVR.


    16. https://www.bordercolliefanclub.com/bramble-the-vegan-dog-lives-to-189-years/


    17. https://aminoapps.com/c/vegan/page/blog/vegan-dog-lives-to-27-years-of-age/N4ai_MuaRE5qNoYVN1DN85ap0GVjz3j


    18. https://v-dog.com/blogs/v-dog-blog/vegan-diets-for-dogs-what-about-longevity


    19. https://www.fediaf.org/39-prepared-pet-foods/80-understanding-labels.html


    20. https://vetnutrition.tufts.edu/2016/07/vegan-dogs-a-healthy-lifestyle-or-going-against-nature/

    21. https://www.petmd.com/dog/nutrition/7-interesting-facts-about-your-dogs-digestive-system

    22. http://www.vivo.colostate.edu/hbooks/pathphys/digestion/pregastric/dogpage.html

    23. Félix AP, Zanatta CP, Brito CB, et al. (2013) Digestibility and metabolizable energy of raw soybeans manufactured with different processing treatments and fed to adult dogs and puppies. J Anim Sci;91:2794–2801.


    24. Carciofi A, de-Oliviera L, Valério A, et al. (2009) Comparison of micronized whole soybeans to common protein sources in dry dog and cat diets. Anim Feed Sci Technol;151:251–260.

    25. Yamka R, Kitts S, Harmon D. (2005) Evaluation of low-oligosaccharide and low-oligosaccharide low-phytate whole soya beans in canine foods. Anim Feed Sci Technol;120:79–91.

    26. Hill D. (2004) Alternative proteins in companion animal nutrition, in Proceedings. Pet Food Assoc Canada Fall Conf;1–12

    28. Hazewinkel HA, Tryfonidou MA. (2002) Vitamin D3 metabolism in dogs. Mol Cell Endocrinol;197:23–33.
    Boland R, Skliar M, Curino A, et al. (2003) Vitamin D compounds in plants. Plant Sci;164:357–369.

    29. Jäpelt RB, Jakobsen J. (2013) Vitamin D in plants: a review of occurrence, analysis, and biosynthesis. Front Plant Sci;4:136

    30. Knight, A. and Leitsberger, M. (2016). Vegetarian versus meat-based diets for companion animals. Animals 6, 57.

    31. Dodd SAS, Adolphe JL, Verbrugghe A. (2018) Plant-based diets for dogs. J Am Vet Med Assoc. Dec 1;253(11):1425-1432. doi: 10.2460/javma.253.11.1425. PMID: 30451617.

    32. https://www.petmd.com/dog/wellness/evr_dg_how_long_do_dogs_live [Accessed 2 June 2021]

    33. https://www.utep.edu/leb/pleistnm/stuff/stuff2.htm [Accessed 2 June 2021]

    34. M S Martins, N K Sakomura, D F Souza, F O R Filho, M O S Gomes, R S Vasconcellos, A C Carciofi (2014) Brewer’s yeast and sugarcane yeast as protein sources for dogs, J Anim Physiol Anim Nutr (Berl) 2014 Oct;98(5):948-57. doi: 10.1111/jpn.12145.

    35. Christina Golder, James L Weemhoff, Dennis E Jewell (2020) Cats Have Increased Protein Digestibility as Compared to Dogs and Improve Their Ability to Absorb Protein as Dietary Protein Intake Shifts from Animal to Plant Sources 24;10(3):541. doi: 10.3390/ani10030541.

    36. Henkel J. (2000) Soy. Health claims for soy protein, questions about other components. FDA Consum ;34(3):13–15,18–20.

    37. Yalçin, Sakine & Erol, H & Özsoy, Bülent & Onbaşılar, I. (2008) Effects of the usage of dried brewing yeast in the diets on the performance, egg traits and blood parameters in quails. Animal : an international journal of animal bioscience. 2. 1780-5. 10.1017/S1751731108003170.

    38. Rosser EJ (1993) Diagnosis of food allergy in dogs. Journal of the American Veterinary Medical Association; 203(2):259-262.

    39. Mueller RS, Olivry T, Prélaud P. (2016) Critically appraised topic on adverse food reactions of companion animals: common food allergen sources in dogs and cats. BMC Vet Res.12:9. Published 2016 Jan 12. doi:10.1186/s12917-016-0633-8

    40. https://www.kentlive.news/whats-on/shopping/salmonella-fears-spark-urgent-recall-4328262

    41. https://www.food.gov.uk/news-alerts/alert/fsa-prin-31-2020

    42. L. Martinez-Anton, M. Marenda, S.M. Firestone, R.N. Bushell, G. Child, A.I. Hamilton, S.N. Long, M.A.R. Le Chevoir (2018) Investigation of the Role of Campylobacter Infection in Suspected Acute Polyradiculoneuritis in Dog


    43. https://www.foodsafetynews.com/2018/10/four-stec-infections-one-person-dead-after-exposure-to-raw-pet-food/

    44. https://www.theguardian.com/science/2018/jan/12/scientists-criticise-trend-for-raw-meat-pet-food-after-analysis-finds-pathogens

    45. https://news.cancerresearchuk.org/2015/10/26/processed-meat-and-cancer-what-you-need-to-know/

    46. D.F. Merlo, L. Rossi, C. Pellegrino, M. Ceppi, U. Cardellino, C. Capurro, A. Ratto, P.L. Sambucco, V. Sestito, G. Tanara, V. Bocchini (2008) Cancer Incidence in Pet Dogs: Findings of the Animal Tumor Registry of Genoa, Italy
    https://doi.org/10.1111/j.1939-1676.2008.0133.x , journal of veterinary internal medicine

    47. https://www.pfma.org.uk/_assets/docs/White%20Papers/PFMA-Obesity-Report-2019.pdf

    48. https://www.pfma.org.uk/grain-free-factsheet

    49. https://fediaf.org/images/FEDIAF_Nutritional_Guidelines_2020_20200917.pdf

    50. https://www.ksvdl.org/resources/documents/dcm-forum/Confidential-Abstract-for-release-October-14-2020-Final.pdf

    51. https://www.ksvdl.org/resources/documents/dcm-forum/DCM-Forum-SolomonOpening-Remarks.pdf

    52. https://stpetersbark.com/finally-theres-no-evidence-linking-grain-free-diets-and-non-hereditary-heart-conditions-in-dogs/

    53. Okin GS (2017) Environmental impacts of food consumption by dogs and cats. PLoS ONE 12(8): e0181301. https://doi.org/10.1371/journal.pone.0181301

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