My female Bengal is stalking my 6 year old male abyssinian like prey. She will not leave him alone. It starts out like she wants to play with him and then she bites him on his neck and he gets upset and it's on. He runs from her and she literally stalks him. He jumps to a high spot and she is right behind him. She won't let up on him. I have cat spats from time to time but nothing like this. Everyone in my household is spay/neutered. I wonder what this new behavior problem is?