Vets Again!

I had to spend all yesterday at yet another vets! He took lots more x-rays and the to cut a long story short (or my my case my leg) I am going in for an Elbow Op.
I hope I didn't hear correctly but I think they are going to take a piece out of one of my leg bones! The cheeky vet said I had "Queen Anne" legs.
So Friday I go in for the day!
As a special treat I got the bone you can see- BUT what worries me is what dog's leg did this piece of bone come from?

Limp-along-Leslie

Having trouble with my leg at the moment, I keep limping at lot.
I have been to the vets and had some x-rays taken and have been told to take it easy on the walking! As if! I do not slow down for anyone-SO confined to lead for my walks RATS (or in my case squirrels - I hate the pesky little things, esp[ecially when the run up trees!)