Linda Arndt ~ Canine Nutritional Consultant

Heart Worm Prevention - Allert

Special Alert - Other Breeds:

For Collie/Sheltie/Aussie and Sighthound Owners (could effect some Great Danes)

For those people who own Collies, Shelties, Sighthounds, Aussies, Border Collies, any breeds with Collie background or mixed breeds with any of these dogs in them, it is critical that you know there are certain medications your dogs CAN'T take. Do not leave it up to your vet to know this..YOU must print this out and know it - it is a matter of life or death.

These dogs have a sensitivity to Ivermectin (Heartguard Heartworm medication. Only use Interceptor heart worm preventative. Other related drugs you can not use on these breeds or there will be neurological damage.
Other related drugs you can NOT use:

Metronidazole (which is used for diarrhea and giardia)

Ivermectin - Heart Guard

There are many different types of drugs that have been reported to cause problems in Collies, ranging from over-the-counter antidiarrheal agents like Imodium® to antiparasitic and chemotherapy agents. It is likely this list will grow to include more drugs as our research progresses.

Drugs that have been documented, or are strongly suspected to cause problems in dogs with the MDR1 mutation:

Ivermectin (antiparasitic agent)
Loperamide (Imodium®; over-the-counter antidiarrheal agent)
Doxorubicin (anticancer agent)
Vincristine (anticancer agent)
Vinblastine (anticancer agent)
Cyclosporin (immunosuppressive agent)
Digoxin (heart drug)
Acepromazine (tranquilizer)
Butorphanol (pain control)
Potential Problem Drugs

The following drugs may potentially cause problems when given to dogs that have the mutation. Biochemical studies have shown that this gene has the potential to act on over 50 different drugs.



Washington State University College of Veterinary Medicine
Veterinary Clinical Pharmacology Laboratory
PO Box 2280
Pullman, WA 99165-2280
(Phone/FAX 509-335-3745)

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