In the last couple of months, she has attacked my male dog many times, though she has not seriously injured him yet.

He had a growth spurt and is now a little larger than she is. She has always been the "alpha" and my only guess is she is feeling threatened by him now. The attacks are unprovoked. The male is a very laid-back dog.

I am of the mindset that animals are not disposable and will do whatever necessary to find a proper home for Callie.

It has been a heart-breaking decision to make, but I can no longer tolerate the fighting and I have no way to keep them separately.