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How to tell if your cat is depressed
Get your cat examined by your veterinarian.
If you notice behavioral changes in your cat, make an appointment with your veterinarian. You want to make sure there isn't an underlying medical issue causing your cat's depression that might require specific treatment.
Tell your vet about any changes you've noticed in your cat, such as changes in appetite, sleeping habits, and personality. Your veterinarian will perform a routine physical exam, listening to your cat's heart beat, examining her eyes and ears, and taking her temperature.