I think turning into a werewolf would just make dogs dislike you more, seeing as how you'd smell like 1) another dog impugning on their territory and 2) something not of this earth, which dogs are well-known for disliking. Also the whole "weak vs. silver, crave human flesh" thing would be mighty inconvenient.
As for being host to a dog spirit, wouldn't that just make you want to scratch in public and mark your territory in a highly unsanitary fashion?
You could always invest in a dog-scaring whistle, y'know.