Last spring my dog Jesse presented with head tremors for about 2 1/2 days, I contacted Kim to see if he had seen it in any of his other dogs and he shared that after worming one had shown a similar thing after receiving worming medication, I believe he said Ivermectin but am not positive on that. I had wormed Jesse some time before his tremors but couldn't remember exactly when. Some herding breeds carry a gene mutation called MDR1 that causes them to be extremely sensitive to some drugs (Ivermectin, Loperamide and some anti-cancer medications) and my vet suggested I have him tested to see if he carries the gene. The test is available through Washington State University and is a simple swab test. I had both my dogs, Kai and Jesse, tested and was very pleased with the result that they DO NOT carry the MDR1 mutation! Yay!
Just more proof that these are absolutely the perfect dog!