Shetland teething period is normally on which month? My puppy is doig excessive chewing and biting. Tried to stop him and he got excited and kept running around...

I have a 3 months old male tri-color shetland. Initially, both side of his ears were folded downwards. However, the right ear started to straighten up straight recenty while the left remain folded downwards.

I thought that when he was list...