My boy who is about 61/2 7 mths old has thin hair down the middle of his back behind his shoulders down to his rear. Its not bald just thin in spots and can see skin in light. He is feed diamond naturals lamb n rice kibble mixed with wet can food also. Any ideas. Diamond naturals I think is a 4* kibble, so I am not thinking poor diet. Any suggestions. It's been this way for a 2 mths and just thought it was his kennel rubbing his back .( he loves his man cave n puts himself to bed in it. Lol)open to all suggestions. Thanks