Behavior changes can be unsettling. A cat that has tolerated handling for over a year may suddenly growl or hiss for several reasons.
Physical Discomfort
Pain from arthritis, injury, or illness such as hyperthyroidism or kidney disease can make a cat sensitive to touch.
Environment and Routine
Stressful events like moving, new pets, or schedule changes can trigger aggression. Even a minor illness can affect behavior.
Handling and Age
Changes in how you pick up your cat, or unexpected touching while it is sleeping or eating, can cause a negative reaction. Older cats may become more sensitive to touch.
What to Do
Observe when the behavior happens. Schedule a veterinary visit to rule out medical issues. Avoid picking up your cat during triggering situations. Consider a certified animal behaviorist if needed. Never punish your cat for growling or hissing, as these are natural warning signs.