Not as a breed of dog, they don't. I remember seeing a three legged dog some years ago. It had had a leg amputated, and had no trouble moving about on three legs. So, three legged dogs exist only in the capacity of an amputee.
Charlie the Three Legged Dog - 2011 was released on: USA: 11 June 2011 (Delray Beach Film Festival)
The three-legged dog is named Cody.
Edward Steichen.
A three-legged dog named "Trowser".
You should probably take your dog to a veterinarian, particularly if your dog became three-legged through an amputation to control cancer or infection - the cancer or infection may have spread to the back leg she now can't walk on.
I came to get the man who shot my paw!
Dog Tales - 2007 Adopting Three Legged Dogs Pug Profile 1-7 was released on: USA: 15 October 2007
Youtube is your best bet.
Practicing the three-legged dog yoga pose in your daily routine can help improve balance, strengthen your core and upper body muscles, increase flexibility in your hips and hamstrings, and promote a sense of calm and focus.
Not naturally. Dogs can be born without legs or lose them through an accident. There is a video on You Tube of a dog that only has it's hind legs and it walks upright.
Three legged stands are often called stools. In photography a three legged stand is called a tripod.
this is quite common in small dogs, eg jack russell. it is called patella luxation which is where the kneecaps dislocate causing a three legged hop for a step or two. there is nothing to worry about, but you can get it corrected with surgery.