Maggie didn't make a sound until she was 6 months. She started to bark at about 9 months and now at 2 has a more mature, full beagle bark. The biting didn't stop until she had all her permanent teeth. In fact when she was spayed my vet removed two back baby teeth because the permanent ones came in without the old ones coming out. Thats when she really stopped chewing on things. The biting got noticibly better at about 6 months. I thought she would never stop biting hands, arms,toes and chewing everything she could get ahold of but it does get better. I think it is a combination of maturing enough to understand what we wanted her to do and her mouth being more comfortable with all her permanent teeth finally in.