I Just Picked Up My Spoodle From A Dog Kennel

I just picked up my spoodle from a dog kennel which we always leave him in and he is not himself. He seems frightened and won't leave my sight and when I touch between his back left leg he yelps and goes to bite me which he has NEVER done before. I have looked at the area for a bog bite or blood, but nothing showing.
I'm really worried