Hi again, Topsy,
Forgive me for asking a stupid question, but it is about the pet flap. Does it not swing both ways?
My father actually had to show our pets how to use it, you know, pushing (gently) their heads into it so it would open & even coaxing them forward through it. If I recall correctly, he did that with both cats and dogs. More than once! Did we have dumb animals, or what?
Then, if you have a fully functioning pet flap, & Fluffy gets the idea, you might close the bathroom door so Fluffy cannot jump out the busted screen?
As for the aggression towards Pupdog, I don't know. I wonder how much socialising Fluffy had before coming to live with you?
I'm sure Mekitty would not have tolerated any other pets. I had not had opportunity to socialise her around other animals for the first year & a half.
When one of my neighbours got a small dog, & she'd let her play around outside, near my flat, & from inside, sitting on the windowsill, Mekitty hissed and even clawed the window!
Another time I was taking her up to the Vet. To do that, I had her in her crate, atop my four-wheeled trolley, quite secure, I assure you. We encountered a cat who lived across the road. He was a big ginger, mostly harmless, but Mekitty took exception to him, too. & she hissed & snarled at him. & had a low growling in her throat for other animals at the Vet/s.
When I was a child, we had lots of room. I think, if any didn't get along, they could easily avoid each other. On the whole, though, I think they were all pretty good. One little Chihuahua cross took to randomly nipping, mostly visitors, on the ankle! Eventually, he had to be removed to another room while we had visitors.
My dad could train the dogs. The cats rarely seemed to respond to any sort of training. But, Dad could call Dennis (the white cat) from across the road, & Dennis would come. It wasn't for food either.
Both the cats & dogs liked each other's food. I wouldn't recommend that, as the Vet told me, the nutritional need of cats and dogs is different.
I wonder , how hungry would Fluffy get before she'd eat food you have provided, even if it was the same brand/flavour as yesterday's? Sounds too cruel - maybe ask the vet about the food...I know I used to feed Mekitty too much. I knew I should have been more disciplined about how much I fed her, & not let her get so fat. The Vet was getting onto me in the few months before she died.
I will take a look around Googleland & find, hopefully, something.