My dog is more aggressive now since I've gotten her spayed than before. Is this normal?

Shadow

New member
She is a Border Collie/Chow mix and I also own her brother and her son. They have never fought before but it seems like around the same time every month they get in a fight and we have to separate them. Is this normal or any ideas on how to calm her down. She wasn't like this before we got her spayed.
 
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