There are too many factors to say if dogs and cats are more or less healthy than people.

 There are too many factors to say if dogs and cats are more or less healthy than people. Some breeds have so many inbred mutations that they are by default less healthy than normal. And it is not always true that only drinking water results in a long life. Drinking contaminated water will not do you any favors, yes but just drinking water alone is not enough. You have to look at the entirety of the diet especially in relation to how much exercise you get. If drinking clean water only means you reduce other less healthy drinks then that is a definite benefit Eating clean food and drink and exercising - or not - is totally separate from the typical maximum age a species can expect to live to.

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