Yoda found himself at the shelter as a stray. But we know that dogs don't live to be 13 years living on their own in the streets. So Yoda was probably let go by his family when he got too old to deal with. You see Yoda has severe arthritis and could barely walk so he more than likely didn't wonder off on his own.
But now Yoda is in a wonderful foster home. He has a cushy, orthopedic bed to rest on. His foster mom set him up by the picture window and he loves to look out the window.
Now that Yoda has been on pain medicine he is feeling much better as far as his arthritis. He is more steady on his feet and can get up and down with less trouble.
For now we are just going to let Yoda relax and enjoy being a dog.