We judge animals' intelligence purely according to our own fairly arbitrary definitions though. And according to our own, pathetic, human limitations. Like the flea products, people say that their cat or dog 'knows' when you're hiding that in your hand or are about to use it on them - I expect, to a cat or dog, that stuff smells nasty and they can smell it through the packaging. They can smell when you've put it on others in the house and know it's their turn next. They can smell stuff that we don't think smells at all, and pinpoint which cupboard it's in.
Is this 'intelligence', or just animals having abilities that humans don't?