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Dr. Gary
Dr. Gary, Cat Veterinarian
Category: Cat Veterinary
Satisfied Customers: 3916
Experience:  DVM, Emergency Veterinarian, BS (Physiology)
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My cat got into my dogs heart worm medications my Dog is a

Customer Question

My cat got into my dogs heart worm medications my Dog is a 85lbs German shepherd. I suspect my cat ate anywhere between 1-5 pills. The brand was tri-heart plus. He threw up last night and today is extremely lathargic. Laying down next to his liter box and moving very slowly some interest in food but not his normal self. Shluld I be concerned?
Submitted: 8 months ago.
Category: Cat Veterinary
Expert:  PitRottMommy replied 8 months ago.

Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.

Expert:  PitRottMommy replied 8 months ago.

How long ago did Spunkerz eat this medication?

How much does he weigh?

Customer: replied 8 months ago.
He is about 10 lbs
Expert:  PitRottMommy replied 8 months ago.

How long ago did Spunkerz eat this medication?

Expert:  PitRottMommy replied 8 months ago.

The good news is that this medication has a very high tolerance rate in cats. Cats, in general, for heartworm prevention receive 4x as much medication as dogs do.

The main concern we would have here is the ivermectin. Pyrantel, the other active ingredient in this medication, doesn't usually cause major symptoms but we could expect to see vomiting and diarrhea over the next few days.

Ivermectin acute toxicity info states that adult cats receiving at least 750 mcg/kg at one time show no effects of illness. For this, your cat would need to consume almost 3500mcg of the medication or, roughly, 12.5 tablets as the concentration of ivermectin in these tablets comes to 272mcg of ivermectin. With this, Spunkerz has only had half of a dosage that we already know to be safe for cats. Do keep an eye out for any signs of drunken walking, dilated eyes, acute onset blindness, seizures, tremors and vomiting/diarrhea. If any of them arise, please have your companion examined promptly by a vet open at that time.

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Customer: replied 8 months ago.
He just seems lathargic. He just lays down. I set him in a cat bed last night at 8pm and woke up with morning and he hasn't moved at all. He's usually very playful. No dilated eyes. He won't walk so I wouldn't know if he was Drunk walking.
Expert:  PitRottMommy replied 8 months ago.

I think it's very likely that he's suffering from a profound GI upset and I would certainly consider a physical exam by a vet with the behavior.

Expert:  PitRottMommy replied 8 months ago.

Checking in, JACustomer. I didn't hear back from you yesterday. How is your companion doing?