I had a ruby puppy boy with slipping patellas both legs that I was advised to gently lead walk up hills, he also had episodic falling and a heart problem so I opted out of an operation on him, deciding to let nature take its course and that we would just enjoy what little time we had with him, (he was six months old).
I lost him about five months ago ..... he was almost 14yrs old and had more problems than I could ever list...... there is always hope.....
Good luck with your little lad,
Ruth