I have to agree with the other two -- it may well be to help him gauge water depth. Stanley has a depth perception problem and if the water isn't to the very tip-top of the dish, he has trouble finding it and drags his paws across it to ripple it so he knows where to drink. I've tried different bowls... Wouldn't worry about it. Your cat seems to have found the "trick" to drink!
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Tammy
Stanley and Pookey

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