Very.
I have not met one that is not.
Generally limping.
if you treated it well the sprain of the dog will heal for 3-4 weeks if you did not treated it well it could be months!
If you think your puppy has sprained a leg (or is not bearing weight on one leg or limping), you need to take him to a vet. Call your vet and tell him/her exactly what your puppy is doing and they will decide if you need to bring the dog in ASAP, or if it can wait a day or so.
ask your mom to do it for you
Yes
I recommend doing the jerk.
If your dog won't walk on its front leg, there is either physical pain present or some type of malfunction or instability within the leg itself. It is not normal for a dog to refuse to use its front leg.
swiming
Well, the dog will be limping if a leg or arm. The bone could be a little crooked. It will be weak and maybe your dog will be yelping. Try rubbing all bones of the dog if you suspect a sprain. If it is a broken bone, see the vet IMEDIATLY!
A dog has two knees. One on each front leg in the middle.
Usually dog harnesses come in a few size fits all sizes. Small medium and large dog. A measurement across the chest from outside front leg to outside front leg should get you in the ball park.
because he has to do that or else the dog dies