My 10 month old GSD just went in for surgery on Monday to get neutured. Surgery went well and seems to be making a successful recovery. We also have an 6 month old English Bull Dog who is currently still intact (for another 2 weeks). Kreider (GSD) got along well with Nash (EBD) they are pack mates, but after the surgery Kreider is showing aggression towards Nash and attacked him 2x last night for no reason, Nash was just walking by. Do you think it is bc Kreider is in pain and is just telling Nash to stay away from him or would it be bc Nash is still intact and Kreider senses that? Please help!!