Had a lovely trip , booked a pet sitter apparently he was fine while we were away had regular pictures of him , he's been fed and watered. He's always a bit strange when we get back , one time he had pooed in the hallway just before we got back. The last two times he's attacked my DH no prior warning no growling hissing he jumped and latched his jaws around his leg and claws. He doesn't do this normally and never attacks me and DD. What's his problem ?