Well this could be for several reasons. First the pony or horse might have been posed for a picture by a human and taught to stand that way. Another reason is that if it were a stallion or gelding it might be about to pee or just finished peeing. It may also be doing it as a sign that it's ready to breed if it's a mare or filly, and lastly it may be sick and is trying to alleviate the pain.
It can be, because it can damage your "bum". You can stick a lot of things in your "bum", but be carefull. well, i hope this helped you ! ^_^
BUM HOLES
you stick a chicken up your bum bum
Because your bum is the top of your legs. They're connected together at the top, and they call that part your bum.
stick you finger up you bum!
Stick it up your bum
Poop sticks to bum hair because Your bum hair is very long obviously. Mine does not stick because i shave my butt
stick it up your bum
Because if I didn't have one I'd have no legs!
yes
A meter stick measures height
you have to stıck your legs up your wall and lay down on your back on the ground you wıll have to do ıt 20 ns a day and ou wıll get a result ın to weeks