I’ve got a big dog that was born with three legs, the fourth, one of his front legs, is just a stub.
He’s fine going on three- chased mail trucks until I trained him not to, still chases coyotes and fights raccoons way out into the swamp around cypress knees and downed logs with no noticeable difference in speed from a regular dog, chased an intruder on my property but lost the guy when the man scrambled over a fence that the dog could not. The only thing that he is limited on is when he attempts to jump up into truck... he has a hard time grabbing on to pull himself up with one foreleg now that he’s older and fatter so it takes a few tries.
A three legged dog will be just fine but try to keep it on the thin side so its weight doesn’t cause extra wear and tear [and can get in your truck without a forklift.]
Thanks for your story. I loled a few times.... It is great to hear a story like yours. Take care and thanks again.