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rambo6986 t1_izvd3bp wrote

Why can't they suck?

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kmn493 t1_izw9rnu wrote

Their mouths are large and unsealed. Humans have a tiny gap at the front. Dogs' gap starts all the way in the back of their jaw. See this image for reference. The surface of the water would have to be all the way back there before they could get the suction. So their entire muzzle (including their nostrils) would have to be under water.

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