Thank you all for the responses. On one hand I apologize, because I didn't mean to overalarm you, but I was very concerned after this call from the vet because I absolutely love Polo and wanted to make the correct decision. To clear things up a bit, it is completely legal in Washington State to own even wolf hybrids. People in the state who do own them get them vaccinated "off label", I had never heard anything about this law before. Also, my vet is a good and caring person, and she is not trying to do anything cruel or "trap" me by having me sign some paper, she just wants to be sure and cover her own butt because, as Hanka has pointed out to me in email many times
, there some (not all!) crazy people in America, and they will do anything to create a lawsuit, etc.
Having said all that, I most certainly will not sign any paper saying that Polo is a "hybrid". In fact, with my previous animal Toby (who was nearly 100% Eastern Timberwolf) I told the vets only that he was some kind of sheperd mix just to avoid this kind of problem, and since there is no medically distinguishable factors they could never say that he is part wolf. Toby did get all vaccinations, and never had any problems.
I think the best course is to talk to my vet and tell her that I will only sign a form that Polo is an FCI recognized breed of dog, but nothing more. I think that she will want the paper to say that "the rabbies vaccination isn't proven to be effective", and I don't know exactly how to counter that. I did a lot of research last night and it sounds like even the USDA was really convinced that these vaccinations should work on even pure wolves, but only repealed to rule in order to discourage domestic ownership in the US.
I will also ask her about what kind of research she did, I know when I talked to her yesterday she mentioned that she spoke to someone who served as sort of the "head vetrinary" for the state. I'll look into this more, and post more info as I have it.