Walker is 4 months old and has been a biter since we got him at 8 weeks. He is still a biter, but he's getting better. He is currently teething too which is definately not helping. He knows not to, but still likes to try very hard
I tried the yip when he bites thing to begin with, but it had no effect on him. What worked for us is to flick him (I think it worked to get his attention) and say a sharp "hey!". He's gotten a lot better and now all he needs is the "hey!" to get him to stop. Good luck. and Welcome to Yorkie talk!
