I have a cat and a dog. My cat, Renji, is interested in the tank, and I know he tried to get the lid off once, but otherwise, he doesn't really take much notice in Merlin. My dog, Lucky, is only interested when I'm cleaning out the entire tank, otherwise he's oblivious to Merlin (really he's still oblivious even when I'm cleaning Merlin's tank, since Merlin is still on my dresser and no where near his level.)
Diva noticed the 2 bettas last night. Previously the best purpose for thier tanks was to lay on them for warmth or walk down the row to get to her favorite resting spot. I am not encouraging her interest in either though. She weighs maybe 4-5 lbs and the tops are thick plexiglass.
My cats love nothing more than to sit and stare at my bettas - and the smaller of the two has been caught sitting on the hood of the tank, trying to get it open so she could get in and commit fishy murder on my little girls and guys. When I do water changes I have to keep an eye out because once she hopped up and had her paw in there, trying to get poor little Gold Dust out.
A couple days ago, my new betta, Dragoon, spotted my dog standing next to me, and he swam over and stared at the dog. He seemed to just be curious since he didn't flare or anything, then he went back to staring at me.
Well, I don't have any other pets right now other than fish, but my cousin's cats try to invite themselves over now and then. Her male cat tries to jump up to where the tanks are to get a better look, and the female doesn't really have much interest in them I'm assuming because they can't pet her. She really is an attention hog and demands to be petted whenever she sees someone. Although, if she really got up there by the tanks, she might change her mind and try to eat them.