Petco Text Logo
Petco Pet Logo

Dog has white worms in poop on Trifexis. What wormer can I buy?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | unneutered | 5 months and 18 days old | 5.07 lbs

When taking my pet on his normal walk, I discovered a white worm in his poo. He’s currently taking Trifexis, does this not prevent worms? If not, what can I pick up for him over the counter?

1 Answer

Most Helpful Answer

Image profile

Answered By Chad Brown, DVM

Veterinarian

Published on June 28th, 2018

Hello and thank you for your question. First, I Just want to applaud you for taking a prophylactic approach to heartworm and internal parasites by giving trifexis monthly. Great job. Trifexis takes care of and prevents roundworms, hookworms, and whipworms. It does not, however, prevent a dog from getting infested by other internal parasites such as tapeworms or coccidia. Because there are so many different types of medications available over the counter that treat different types of worms in a dogs gastrointestinal tract, I encourage you to take a fecal sample to your local veterinarian to get a definite diagnosis and correct treatment. It would be best to take in a sample of the feces as well as one of the worms that you find for best results. I hope this helps. Have a great day.

Vote icon

3Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored