No, not all cats are affected by catnip. Only about 50-70% of cats have a genetic sensitivity to the nepetalactone compound in catnip that causes the behavioral response. Kittens under six months old are typically not responsive to catnip, as the sensitivity develops with age. Some cats may also have a muted response or no response to catnip due to genetics, changes in hormonal or neurological conditions, or because they have become desensitized to the herb through overexposure.

There are several other factors that can affect a cat’s sensitivity to catnip, including their breed, sex, and reproductive status. Studies have shown that certain breeds of cats, such as Siamese, are more likely to be sensitive to catnip than others. Male cats are also more likely to respond to catnip than female cats, and neutered cats are less likely to respond than intact cats.

In addition to these factors, a cat’s response to catnip can also depend on the form in which it is presented. Fresh catnip is often more potent than dried catnip, and the way in which it is processed can also affect its potency. Some cats may prefer the scent of certain varieties of catnip over others, and exposure to other scents or environmental factors can also impact their response.

It’s important to note that while catnip is generally considered safe for cats, some cats may have adverse reactions to it. Overexposure to catnip can cause some cats to become agitated or aggressive, and may even cause vomiting or diarrhea in extreme cases. If your cat has a negative reaction to catnip, it’s important to limit their exposure or avoid it altogether.

In conclusion, not all cats are affected by catnip, and a cat’s sensitivity to the herb can depend on a variety of factors, including genetics, breed, sex, reproductive status, and the form and potency of the catnip. If your cat does not seem to respond to catnip, there is no need to continue giving it to them. As always, it’s important to monitor your cat’s response to any new substance or environmental factor, and to consult with a veterinarian if you have any concerns about your cat’s health or behavior.

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