Dogs wag their tails mostly to the right when they're happy and to the left when they're frightened.
When dogs feel fundamentally positive about something or someone, their tails wag more to the right side of their rumps. When they have negative feelings, their tail wagging is biased to the left.
Dogs and cats mainly sweat from their footpads.
Humans and dogs first became best friends 30,000 years ago, scientists believe.
There are more than 40 cat breeds.
Cats can't taste the sweetness.
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