kolanuraven
Well-known member
- Joined
- Jul 27, 2005
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Keep us posted as we're all ' dog people', except for Soapweed, here and really want to know what you find out.
Many herding dog breeds are afflicted with a mutation of the multi-drug resistance (mdr1) gene. This gene encodes a protein (P-glycoprotein) that is responsible for removing certain drugs and toxins from the brain. Dogs that carry the mdr1 genetic defect cannot rid their brains of the problem drugs. The result is a neurotoxic buildup that can cause abnormal neurological symptoms and/or death.
Breeds known to carry the mdr1 mutation include Australian Shepherds of all sizes, Collies, English Shepherds, Longhaired Whippets, McNabs, Old English Sheepdogs, Shetland Sheepdogs, and Silken Windhounds. Research has shown that three of every four Collies have at least one copy of the mutated gene.
This also means that if your mixed breed dog has, or you think s/he might have, any of these breeds in its pedigree, you should test your dog and avoid the drugs on the list until you have test results.
There is now a test available to screen for the presence of the mutated mdr1 gene. Test results indicate if the dog carries two, one or no copies of the mutated gene. For further information on the mdr1 genetic mutation and the test, visit the website of the Veterinary Clinical Pharmacology Laboratory at Washington State University's College of Veterinary Medicine at http://www.vetmed.wsu.edu/depts-VCPL/
Problem Drugs
Dogs from affected breeds who carry the mutated gene OR who have not been tested for the mutation should avoid using drugs from the MDR1 Problem Drugs List (see next page). The list is divided into drugs known to cause mdr1 mutation problems and drugs suspected of causing mdr1 mutation problems.
The most commonly prescribed drug on the list is ivermectin, a wormer used in many canine heartworm preventative treatments including Heartguard, Iverhart, Tri-Heart and Advantage DUO. Dogs in the affected breeds should use milbemycin oxide (Interceptor) for heartworm preventative instead of ivermectin as it's generally considered a safer alternative. Ivermectin can also be found in many livestock wormers (dogs should be kept away during and for several days after livestock worming), and in home and yard insecticides (under the names avermectin or abamectin).
Other frequently used drugs on the list include loperamide for diarrhea (most commonly sold as Imodium); morphine; butorphanol for pain and cough suppression; and acepromazine (prescribed as Ace, ACP, or Atravet) for tranquilizing, calming, and anesthesia use.
These problem drugs are dispensed in many forms including pills, liquids, injections, and ointments. Check ALL drugs you are considering giving your dog against this list if your dog either carries the mutated gene or has not yet been tested for the gene.
Mournful Tune said:I have been waiting to reply hoping I would have more to report but there hasn't been much change. The x-rays that we had done didn't show anything. The vet who did the x-ray however felt that the problem with Chaco (that's our dog's name) was some kind of Obessive Compulsive Disorder and suggested a drug therapy. We have tried that for about a month but there wasn't any change. We are back to the theory that he is responding to some source of pain and are now trying a drug (Gabapentin) that can help with nerve pain. He has only been on it since Friday so it's too soon to say much. Yesterday I thought he seemed marginally better, the episodes seemed less severe and less frequent. In between he is lively, animated, and eager.
I appreciate everyone's continued interest.