The kind of water bowl that is best for cats is either glass, ceramic or stainless steel and reasonably shallow. The shallowness is to avoid your cat’s whiskers brushing against the sides as they drink. Some cats don’t like this, apparently. The reason for glass, stainless steel or ceramic bowls is twofold. Some people believe that you can’t clean plastic bowls properly because bacteria can build up inside the scratches of the bowl which can predispose cats to developing feline acne.
An alternative reason is that a similar condition to feline acne is an allergic reaction to rubber or plastic water bowls (and food bowls of course). Either way, plastic bowls are less good than glass, ceramic or stainless steel ones. If your cat has feline acne and you’re struggling to deal with it then you should at least change his bowl if he is using a plastic one. You will also need to see your vet about it but it normally responds to cleansing of the skin twice a day with an ointment or gel containing 2.5 to 5% benzoyl peroxide.
There is one other point to make about glass bowls. It has been theorised, and it may be a practical point, that cats prefer to drink out of glass bowls. This may be a visual thing. It may encourage a cat to drink and we know that that is important because they are poor drinkers; their DNA makes them like that because they inherited it from their wild cat ancestor.
You probably know this already. Domestic gas tend to prefer muddy puddles outside to tap water which has been chlorinated. Rainwater is purer and does not contain the chemicals that tap water does.
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