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Is my new stray's hunger from worms? Is Advantage Multi working?

Updated on September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | 1 year and 3 months old | 5 lbs

Hi, I adopted Jasper after finding him as a stray a couple of weeks ago and nobody claimed him. I had the vet examine him and provide him with advantage multi 5 days ago. He is very hungry. I'm wondering if he might have worms? would the vet have detected worms? Would the advantage multi have kicked in yet? Thanks a lot!!!

1 Answer

Most Helpful Answer

Christie Long, DVM

Answered By Christie Long, DVM

Veterinarian, Certified Veterinary Acupuncturist

Published on January 27th, 2017

For starters, congrats on your new pet, and thank you for giving a homeless animal a home! Yes, the Advantage should have already started working, and if you're still seeing fleas on Jasper he may need a dose of Capstar in order to knock them all down. That's an oral medication that causes adult fleas to leave the pet; you can get it from your vet or at a pet store. The Advantage should handle the rest.

Regarding intestinal parasites, a fecal exam is needed to verify the presence of those in the intestinal tract. Although Advantage Multi prevents some intestinal parasites, it's not always effective at resolving existing intestinal parasite infestations. So it's probably a good idea to have your vet check Jasper's stool sample for the presence of parasites and deworm him accordingly.

Keep in mind too that he may be ravenous because he's been on the street! But absolutely I would check for intestinal parasites as a precaution.
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