Our Skippy isn't thrilled with Gabby-12 weeks old- he's gotten alot better as far as barking and drooling, he even lets her paw at his head and sniff him...but now he's starting to push her around with his head- he is 18 pounds of 4 yr old boy. I don't know what he's up to when he does this so I intervene by picking her up and yelling "no!" at him. Any suggstions? Is this behavior that says biting is next?