We have a 8 week old puppy. His attitude has been changing lately. He would bite my wife's toes and pants. My wife would say " No" and push his head away but he would try to snap at her hand. He has his moments when he knows to lick and not bite but as the day goes by he goes back to trying to chase and bite her feet. Is this something I should be concerned about. I don't want him to bite my kids when he grows old. This is our first family dog and any advice would be appreciated.