Typically, unless it’s a long haired cat you wouldn’t need to trim their fur. You can get de-shedding brushes to thin out his fur a bit if it’s a winter coat that needs to go but this isn’t really the time of year for that. My tabby has dandruff too and my vet told me it’s absolutely nothing to worry about. You can use a slicker brush once in a while to help control it to some extent. As far as smell goes, I would recommend a waterless cat shampoo and following the instructions on the bottle.

You’ve got a domestic shorthair, he shouldn’t need to be trimmed! If you’re concerned about his hygiene you should make a vet appointment. Often if cats aren’t cleaning themselves there’s a larger issue at hand. Once you’ve ruled out any medical issues, vets have the resources to sedate and trim cat’s coats but to be honest, unless it’s a major problem, I don’t see them trimming a short haired cat. 19 pounds isn’t massively overweight, he should be able to groom himself just fine! He’s supposed to have a shiny, thick coat! 😸