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Cats make clicking noises with their teeth when in the vicinity of potential prey, such as birds, squirrels or moving toys. This instinctive behavior is sometimes referred to as chattering and is seen in both domesticated cats and feral cats. While this sound is normal if made occasionally, if you observe your cat consistently clicking his teeth together, this could indicate a dental problem, which requires the attention of a veterinarian.
Onion tops are toxic to cats, as are all parts of the onion. Onions are members of the allium family of bulbs, which also includes garlic, leeks, shallots, lilies and other plants. Although alliums have many health benefits for humans, including alleviation of asthma symptoms, ingestion of onion tops by cats can lead to illness and death. It is essential to keep your cat away from green onions, and to be aware of the signs of onion toxicity.
The usual reason a cat gains weight is because he consumes more calories than can be burned off. Being overweight can predispose a cat to heart disease, arthritis and diabetes. The cat also needs to cut down on any human foods, which may be loaded with calories, and encouraged to play more. Don't leave food out in a bowl all day long, so the cat can snack at will. A diet plan can be set up by you and your vet. Contrary to popular belief, neutering or spaying a cat does not cause weight gain.