I had a female Oscar that would go crazy when my dog came into the room. He was old and blind and he would wander over to his corner, and the Oscar would go crazy and start slamming into the tank glass. Meanwhile my poor dog would just go on sniffing, he couldnt even see or hear that there was this 14 inch beast inches away. No matter how many times she hit that glass, she kept trying, she wanted him out of her turf.