I work still an animal shelter where we often get in animals who have to have badly broken legs removed. I wouldn't worry about it, if removing it is the best option then you should remove it. 3 legged dogs get along just fine. I've seen 3 legends run and jump and twirl around in circles, they are often just so happy to be free of the leg that hurt. Maybe they can save the leg but if they can't don't be too sad, little tripods do just great.
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