Is this just playful behaviour or are they unaware that it's their own body part ?
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$\begingroup$ The question is too generic. I have had cats who had no interest in their own tail. The answer would probably have to do with animal psychology. It might even be a bit philosophical. $\endgroup$– takintoolongCommented Nov 26, 2018 at 2:19
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$\begingroup$ @takintoolong re: "I have had cats who had no interest in their own tail." thank you. although this is kind of obvious, I will edit the question to reflect your comment, just in case $\endgroup$– summerrainCommented Nov 26, 2018 at 19:38
1 Answer
I will try to answer this. First of all we have to make a claim. This behavior can be found in many animals behaviors but it is much more common in dogs.
In cats there is a few reason for that:
Born hunter
Feline predators have a genetic desire to chase anything what is moving. So the chasing tail behavior can be just game for practising hunting skills.
OCD
But if this behavior doesn't stop after the cat grew up it might be a serious problem. Just like any compulsion behavior in general it might indicate that your lovely cat has obsessive compulsive disorder. If this is the case, your pet can become much more aggressive, hyperactive.
Source
Perfect Paws: Predatory Behavior of Cats