Why is my neutered cat suddenly aggressive towards his twin?

Question

Adopted along with his twin when they were 4 months old, got them both neutered this month at the age of 2. Siron behaves like a ferral, although he is not one. His twin Mojo is the boss between the two of them. Post neutering, Siron has become aggressive towards his twin Mojo, even when Mojo wants to be friends with him. This behaviour is only when Mojo tries to come close to him, e.g. Siron begins to hiss n growl n begins boxing when Mojo comes close to him. Siron is friendly with me n family. Pet's info: Cat | Domestic Shorthair | Male | neutered | 2 years and 2 months old | 9 lbs

Angel Alvarado, LVT · Accepted Answer

It can take several weeks for testosterone levels to decrease after neutering. Until then, consider using a pheromone product, such as Feliway spray or plug in diffuser, to decrease any anxiety or aggression in the home. Provide extra litter boxes, bowls, toys and bedding to prevent food aggression or resource protection.

Why is my neutered cat suddenly aggressive towards his twin?

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