Thanks Dixieland Dancer for the answer, the chewing problem is getting better now that he has choosen a toy to chew (i added some flavor he likes) so my shoes are safe in a closet.
The nipping is getting better too because i started to teach him the "No bite" command as you told me (ive read it somewhere else this morning), but about the domminant dog how can i tell which one is dominant if this happen:
- when the older dog is drinking water the younger dog come to drink at the same bowl and the older dog just go away and wait for her turn??
- If the younger dog is sleeping in the older dog's bed the older dog just sleep in the floor.
- but for the toys and affection the older dog dont let the younger one go first.
And the older dog keeps nipping and growling to the younger

Thank.