A. With any sudden behavior change, it is always a good idea to schedule a wellness check with your local veterinarian. Sudden aggression in cats (especially ones where the cat breaks the skin with its bite) may indicate an underlying health issue such as pain or illness.
If your cat checks out healthy, it may be a good idea to speak with a behaviorist in your area. Many animal shelters and humane societies will have a list of trainers or behaviorists that can help address your cat's behavioral issue.
Aggression can be tricky to treat, but sometimes techniques such as increased play and activity to reduce boredom, changes in diet or location of litter, food and water, or even common supplements in addition to a new behavior routine are all that is needed.
In some cases, cats may be stressed or overstimulated, causing their aggression. Making sure your cat has a safe place to hide that is away from people, animals and noise can help your cat to feel a little better in the meantime.
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