Why are cats smarter than dogs when it comes to using a kitty litter?

mayerj72 asked:

I’ve had a cat in the past and it was the easiest thing ever to train it how to use a kitty litter. now that I have a dog it’s the hardest thing ever to teach him not to use the house as a toilet. I know that some learn faster than others, but my question is, why do dogs have such a hard time with that and cats don’t? It already seems to be preinstalled in cats.

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