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When will my dog improve after Bayer dewormer for roundworms?

Updated on September 23rd, 2025

Pet's info: Dog | Fell Terrier | Male | unneutered | 1 year and 6 months old | 13.4 lbs

My terrier has what looks like round worms so I gave him Bayer quad dewormer. Does this product work right away? And will I see improvement in my dog soon?

1 Answer

Most Helpful Answer

Linda G,  MS, DVM

Answered By Linda G, MS, DVM

Veterinarian

Published on November 16th, 2019

Hello. Most wormers will begin working the moment they hit the gut, so generally pretty quickly. Depending if Gunner's symptoms were due to the roundworms, he should be doing better within a day or so. Thanks for using Petco Pet Education Center, formerly Petcoach.
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