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Why is dog saliva so tenaciously slimy?

Asked by Coloma (47193points) August 7th, 2016

What makes dog saliva so impossibly slimy, like slug or snail slime, it’s residue just doesn’t want to wash off.
Cats and other animals do not have the same slime factor.
I can wash out a bucket one of the horses just ate their grain from, licking it clean and there is no residue whatsoever. What is it about dog saliva that makes it so resistant to being washed off dog bowls?

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