Hi all, I have a 12 week old doodle that really likes to nip at my 8 year old and 5 year olds heals. Is 3 months old a big teething time fr pups/ Oliver hasn't chewed shoes or anything he's not supposed to (yet) but he likes to nip at the kids heels and clothes. Any suggestions to get him to stop We just say NO and direct him to a che toy. Is this the thing to do and how long does it take for them to 'get it' I've never had a puppy who likes to nip so much. He nips at our inlaws dogs heels too.