Keep in mind that over excitement can in some instances slip over into aggression.
Yes, I could see that. He definitely gets over excited when they are there. But I read other things related to thyroid issues that could explain some of the nervousness, allergies, itchy skin, incessant whining and lack of concentration issues we have been experiencing with Jake over the last 2 months or so. I've read enough to at least warrant a trip to the vet for some testing.