Although not unheard of in my area, a keeper friend of mind had a client shoot a 3 legged Sika pricket on Saturday morning, 3 miles south of Bath. He was out after a cull roe buck and spotted the pricket hobbling down a fenceline at 8 in the morning. On closer inspection, the deer was missing its back right leg below the hock. Thats when the decision was made to shoot it. As it turned out the wound was healing nicely and no doubt the deer would have faired OK if left. Can't fault him for taking the beast though.
The guy who shot it thought it was a fallow.