Cat lovers! What is this behavior (see "Details")?

Maybe they’re following their owners’ example?

=)

Actually, it probably is dry humping. While they don’t have the full complement of hormones, they still have some (most of the hormones come from the testes and ovaries/uterus, not not all of them). They have just enough stimulus to induce a behavior, but they don’t really know why they’re doing it. The visual of the older cat may also be enough of a stimulus for the kitten.

It’s somewhat unusual for cats to exhibit this behavior (it’s more common in castrated and spayed dogs) and it’s very unusual for two cats in the same household. As a matter of fact, it’s fairly common for spayed dogs to have a “false pregnancy” where they will fixate on a toy or doll and actually lactate.

The male didn’t have a retained testicle, did he? (Sometimes one of the testicles remains in the abdominal cavity. Some clinics will just take the easy one, rather than going into the abdomen to search for the other, or sometimes they can’t find it. In those cases, the mystery testicle still continues to produce testosterone.)

My other (rather far fetched) idea is to wonder if you have some sort of environmental estrogen or testosterone that they could be exposed to, but I would assume that everyone in the household would be exhibiting some signs.

In the meantime, they don’t hurt anything by the behavior (except for being socially embarrassing). If it bothers you, take away the blanket that they’ve fixated on and use distraction when they start the behavior – some cat nip, a treat, a favorite toy- and try to redirect that energy.

Sorry I don’t have a better answer for you.

Have they been watching you ?

i thought when they got neutered/castrated all sexual feelings and urges went out along with there bits and bobs.
Non of my cats ever displayed anything like what you describe.
sorry no help from me try a vet

I’ve seen my male cats hump each other. I think they’re just gay..