Because evolution has breed mammals with a sense of "good" and "bad." Food smells good because it's safe to eat. Waste smells bad because eating it will make you sick and die. Those who are shit died. Those who didn't lived.
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My other cat's poops don't smell...
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The specifics of what makes waste smell are typically I believe H2SO4. H2SO4 once was at levels that would kill mammals and as a result we can smell it in really low concentrations. Something like 1 particle per billion. That's what they add to gas. Likely has something to do with diet/internal bacteria and the production of this gas.
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So, theoretically speaking, if I change my cats diet the smell could go away?
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Probably. Yeah. That would be a good step.