A kitten followed us home last year. By "followed" I mean, I climbed into a storm drain and coaxed the little thing to me with kitty treats. We couldn't find another home. By that I mean, the offers were along the lines of "If you can't find anyone else, but I have an older cat", and since we were in the same boat, we just kept her.
That puts us at 3 cats, 2 old ones and the kitten.
A few weeks ago one of the old cats, who has never liked the kitten (they are both gray short-hair), decided to express her dissatisfaction by leaving a present for me each morning directly in FRONT of the litter box.
I tried scooping it more often, and a few other things, and then got her a new litter box, which came yesterday (with little steps for her arthritis!) I moved the old litter box and showed the other cats where it is. They adjusted nicely and are happy.
I showed her the new litter box, which is where the old one was.
She used it, but she also still left her morning present in front of it. I believe the other cats have not used the new one.
How do I break this new habit of hers?