I take Angel to work with me every day. We have a counter and a wall between us and the customers. We don't get many customers, but when we do, he will chase after me when I get up to go to the front counter and be very aggressive toward my legs. I turn and say "NO!" and he goes in his crate. But then, if I reach in and pull him out to meet the customer, he puts his ears back, wags his body and tail, kisses and get excited. I am confused. Why he tries to bite my leg, but is all excited and social when he's done being "aggressive." He only does this if he is on the floor running around. If my husband is holding him when someone comes in, he'll just bark a bit. I don't know what he's doing or how to correct it. Any suggestions.