hi i had my yorkie nuetered in september i was scared to death but he had gone of his food and was going mad at night so we took him to the vet and she said it sounds like there is a bitch on heat near your house because thats how males react because they want to mate so he needs to be nuetered or he will be like this when ever he gets the scent, he also had 2 baby teeth left so they removed them aswell. i thought if he ends up getting cancer in later life its much more risky to have an op when their getting old and i dont want him to get ill like that and those teeth needed to come out so i had him done and he was fine he is so much calmer now aswell and he doesnt get frusterated like he used to so i was glad i had it done. i've been going to this vet for 10 years and they had operated on one of my cats twice and looked after my other dog since i first got her and they are great so really you need to ask around and see if someone will recommend a vet! and even ask the vet if they have operated on yorkies before it should rest your mind a little! good luck
