In regards to his knee, He has subluxation of the back knee. He’s always had it from what we know. He saw a vet to determine that awhile ago, my memory was just failing me on what it was called a bit ago. The vet said to just watch it carefully. It hadn’t stopped him from doing the stairs prior. He runs, he sometimes jumps up when excited. He does all activities he could possibly do if he wants to do them!