If you look at the shape of a dog's body, laying on his back (spine) would be an unstable condition, and he'd roll to the side one way or the other. Dogs do not lie on their spine because it hurts. :) There are dogs that lay right on their backs, my dog does it.(Jack Russell)
to scrach their back
they lay on there backs and die and decay
pugs are dogs, and dogs do NOT lay eggs
bettas are not sick when they lay on their side they sleep that way
They cannot sleep on their backs because their body shape and mass makes it impossible for them to lay, let alone sleep on their backs like a dog or cat can. They have a huge gut that can get easily twisted up if they roll onto their backs, and thus can only lay and sleep on their sides or chests with their feet tucked under.
pecking clucking lay eggs eating
they lay on their backs and use a rock to crack it
Dogs are mammals, they do not lay eggs...
Tarantulas may lie upon their backs because they are dead or have been immobilized by the sting of a Tarantula-hawk . ~ see related link . MORE : I have had 4 and they lay on their backs when they molt.
As far as I know, dogs are mammals, which mean that they do not lay eggs but breed from their bodies.
Otters are known for their ability to rest and lie on their backs.