We have a 5 year old female (spayed) Boxer who is the best dog I have ever had! She was easy to train and has been perfect. I don't remember a lot about training her because it felt so easy at the time. We recently got a 8 week old female Boxer pup. She is rowdy and stubborn. She is doing pretty well with house training. She is nipping and biting hands and toes. We are working on that and have seen improvement. My concern is their play together. My older Boxer is great. She is gentle and loves the puppy. The puppy plays good most of the time. I hear her growl at times and she bites my older girl in the face, mouth, nose, neck, cheeks and ears. My old gal never yelps or cries out, she just shakes her off or paws her down and puts her muzzle on her. Occasionally my puppy will get growly and snappy at my big dog. I am struggling to identify if this is still playful or is she is being too aggressive. My older Boxer doesn't let it bother her. Is this normal?