Is this ok? They're brothers and have always been together, and they seem to love one another when they're not fighting - they mostly sleep wrapped around each other, a bit of mutual grooming (actually it's mostly the underling who grooms his brother).
I haven't had two kittens together before and while I know they're doing normal kitten play and it's good for their learning and socialisation, the play-fighting is getting quite vicious. One of the kittens is chunky and basically a solid slab of muscle, the other's like a delicate insect! The vet checked them out during their first jabs this week, said the difference in build was fine and often happens, and that they're both really healthy.
The little one screams and squeals when he inevitably gets bowled over by his chunky brother. His brother is very business-like and generally goes straight for the throat! They're not otherwise displaying any signs that their fights are real - they don't growl, their ears aren't back, they're not holding their bodies rigid or anything like that. But poor little under-cat is getting the worse of it. They do take it in turns to attack and chase, and the underling is quite often the aggressor and continues to goad his brother even when Chunky Cat is knackered and having a rest.
Do I worry about this? Underling cat is so delicate and lightweight, Chunky Cat is like a Sumo wrestler in comparison! Is there anything I can do about it? I think they'd be very unhappy separated.
Pic of when they're loved-up, for Kitten Tax. (Tabby is Underling Cat but closer to the camera.)