I'm so sorry to hear about your boy's leg....I'm always heartbroken when I hear these things...I almost want to print this story up into a flyer and put it under the windshield wiper of every truck I see that has a dog in the back of it....
Luckily, dogs adjust amazingly well with only 3 legs...I think we worry about it more than they do!!
Keep us updated...we are thinking of both of you!