can someone please give me advice for a nippy Yorkshire terrier..we got.him at 6 months old so not quiet sure why he nips and it seems to be males he doesn't know..it has caused a huge fight yesterday cos of my brothers over reaction at a party ..dog was locked in kitchen with me and m brother put his hand over stairgate..got nipped..says the dog should be put down..this is a fella who ignored a dog for ripping his Aston Villa socks!