Two Easy Ways to Start Earning Rewards!
Earn 2X Pals Rewards points at Petco
when you use Petco Pay!
Updated on September 23rd, 2025
Pet's info: Dog | Shih Tzu | Male | neutered | 1 year and 1 month old | 7 lbs
I have an imperial shih tzu. I'm having a hard time finding a heart worm preventative that he can tolerate. I have tried heart guard and interceptor.
2 Answers

Answered By Lauren Kennedy, DVM
Veterinarian
Published on August 1st, 2017
Answered By Dr. Leigh, DVM
Veterinarian
Without having more information, including the adverse signs that he is having after taking the heart worm medication, it is hard to know the best prevention to try. Other options include using Revolution or Advantage Multi and see if either works better. It would probably be a good idea to also consult with your vet and see if he/she has a recommendation.
0Pet Parents found this answer helpful