Scratching is a need, not a defect
Cats scratch to maintain claws, stretch and mark territory. The fix is redirection, not punishment: tall sturdy scratchers (sisal posts) next to the furniture they already target, rewarded with play. Declawing is an amputation of the last toe bone — most veterinary bodies now discourage it.
Petting-induced biting
The "love bite" pattern — purring one second, biting the next — is usually overstimulation, not aggression. Watch the tail: skin-rippling or thrashing means the session is over. End interactions before the bite; punishing it teaches the cat to skip the warning stage.
Nocturnal zoomies and dawn howling
Cats are crepuscular — wired for dawn and dusk hunting. Scheduled play sessions (two 10–15 minute hunts followed by a meal) shift the energy to times you can survive. Merck's behavior-treatment guidance is blunt: occasional feeding in response to howling only reinforces the pattern — consistency is the cure.
Aggression between cats
Territorial friction usually follows a change: a new cat, a vet visit (scent disruption), outdoor cats at the window. Reintroduce like a first meeting — separate spaces, scent swapping, controlled visual contact — and let days, not hours, do the work.
When behavior is medical
Sudden behavior change — hiding, house-soiling in a well-managed box, aggression in a placid cat — deserves a vet check first. Pain, urinary disease and hyperthyroidism all masquerade as behavior problems.