I have a rat terrier jack russel mix who has trouble with vaccines (she’s white) and she suffers seizures with heart worm meds etc...was told by someone some white dogs have this issue.
OK thanks She does fine with Heart Worm but two years same issue on vaccines has me convinced one of the two vaccines she can't handle. I give both dogs Tri-Heart Plus for heart worm. I also dose them with Generic Frontline flea prevention every two months. Last dose was about three weeks ago I guess.
We, and eventually our vet, thinks rattlesnake vaccine killed out little 10 yr. old rat terrier. Yes she was white but I think age has a lot to do with it.
The vet now gives fair warning to folks with small dogs.