Especially the small tiny ones..but if you don't care too much about caring for your girl in heat or ...if they are primarily inside dogs and aren't going to sneak out then you have to weigh your options. I would definately make sure whomever does the spay/nueter has worked alot with small dogs. I can't really say what you should do because I also have heard of yorkies dying after a spay...not so sure about nueters even on YT. My Aunt's Corgie died a couple days after she got spayed( she was 7yrs old)and that was such a tragic loss to my aunt. IT was terrible but then again so many of them go right..you might want to check the statistics out on nueter, maybe it is not as dangerous as a spay?? I am not sure if you could have massive internal bleeding in the testes as you could in the female internal organs?Good luck on your descision.