Ae you kidding? Your Pit is still a puppy! And will behave like one until it's three years old. I once had a Great Dane who ate up my piano bench when he was one and a half years old. Sounds to me like your puppy also suffers from separation anxiety as well as teething issues.
My suggestion is to get a kong and fill it with treats when you're going to leave him in his cage for a while. Also, make sure you have pressed rawhide bones (the white knobby rawhide bones he can choke on) to give him to chew on.
You could also try an old kennel trick and turn on the radio or TV so he can hear it and not feel isolated. If you have his cage in an area where the other dogs in the house can't go I'd suggest that you move the cage so that he can see them and not feel so isolated. Give it more time for him to grow up. Good luck.
She's still a puppy-that breed (along with most of the larger breed dogs) doesn't fully mature until around aged three.
Your Labs have already outgrown the chew stage, she hasn't. Best to crate her when you aren't there to supervise her, at least until she is three years old.
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