Sounds like a back injury , maybe an impinged nerve, maybe a break. You need a Vet consult.
There are also some swine diseases that could cause this. If it is possible to quarantine the animal, until it can be checked out by a vet, it couldn't hurt. Just use caution. Many swine diseases can be transmitted to people. Erysipelothrix rhusiopathiae is one of them. It is bacterial, can cause lameness, and is transmittable. That does not mean it is what you hog has, but you should use precautions until you know for sure.
Lumbosacral is pain at the end of the spine on a cat and it can cause them to kick their hind legs. Fleas and their bites may be a reason a cat kicks their back legs in pain. Taking your cat to the vet will help you find out why you cat is in pain.
This is likely a pig being restrained for field castration, but this method is not often used for humane reasons.
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Two back legs and 2 wings.
snake
in a way. the back legs support the horse and boost him off the ground to run. So yes. If the horse did not have back legs he would not be able to run.
They thump their back legs on the ground and grunt and squeal.
Irritated itchy skin on the back, legs, and hips can mean that the bedding and clothing need to be checked for bedbugs. Another potential cause is dry weather, which can cause skin to be dry and irritable.
You stick out one of your legs and touch your back leg on the ground while bending your front and back leg.
Because you are generally sitting down with your feet off the floor or ground when you are swinging your legs, and your legs just naturally bend at the knees when you are sitting down. It is impossible to swing your legs back and forth standing on your feet.
Lay on the floor against a wall with your back flat on the ground and your legs in the air. Your bottom and back of your legs should be touching the wall. Slowly press your back down even further.
lay down hold someones ankles an then bring your legs up an have them push your legs back down but dont let your legs hit the ground.
You probably haven't cut their fruit small enough...
A donkey kick back exercise should be performed slowly. Begin by laying face down on a weighted bench. Then raise your legs off the ground until they are parallel. Keep your back and legs straight for several seconds and then slowly bring the legs back to the ground. Repeat the process until it becomes too challenging to continue.
B. small pig receiving an injection
Courbette
There are lots of injuries that can cause back pain. Injuries to other limbs, especially the legs, can cause you to hold your body differently. It is the back that takes the strain of this adjustment and results in back pain.