I’m back again for more advice, sorry. I am beginning to get a little bit worried about my puppy biting. He is 4 and a half months old now, I love him to bits but at times he is a bit scary. He hates me putting his lead on and really tries to bite my hand. He also has the habit of running and jumping on the sofa where my husband is sitting, we don’t allow him on the sofa so when my husband tries to get him off ( we use the word ‘off’ and motion with finger from sofa to floor), he refuses and tries to bite my husband when he is physically removed. If I come into the room and say ‘off’ he pauses for a second or two and then complies (unwillingly). Is he just testing the boundaries as toddlers do or is it something we should be concerned about?