Schedule a vet visit to rule out UTI's, arthritis, dementia and other medical causes of behavior changes.
Vet Visit
Reduce environmental stressors like adding/moving furniture, guests or litter box changes triggering acting out.
Stressors
Reinforce consistent feeding, playing, grooming and litter box cleaning routines to ease anxiety.
Routine
If acting out is for attention, dedicate daily focused play and affection on their schedule.
Attention
Use bitter apple sprays, SSScat mats or upside-down tape to deter biting or scratching offenders.
Deterrents
Behavior change takes time. Use rewards for desired actions, not punishment for problems.
Patience
For ongoing issues, seek guidance from a certified cat behavior consultant.
Specialist