Yes, we do. Bill finally makes his way back to Bree and is cared for at the Prancing Pony until the Hobbits' return.
"I’ve something that belongs to you. If you recollect Bill Ferny and the horsethieving: his pony as you bought, well, it’s here. Come back all of itself, it did. But where it had been to you know better than me. It was as shaggy as an old dog and as lean as a clothes-rail, but it was alive. Nob’s looked after it.""What! My Bill?" cried Sam. "Well, I was born lucky, whatever my gaffer may say. There’s another wish come true! Where is he?" Sam would not go to bed until he had visited Bill in his stable.