It looks like Bruno has passed the critical point. This morning he got up and started following us around the house. For the past week, he has just stayed within the same couple of feet in the bedroom. This morning he started seriously purring when we pet him, ate a bit, and just looks way more perky.
I'm not sure if it was the antibiotics or the water they injected under his skin (that's my guess) or finally getting him to eat yesterday but he's showing signs of improvement. He wore himself out this morning trying to be active and has spent the last few hours sleeping on my desk.
I am SOOOOOOO relieved that he's recovering. He still walks funny, but I think he'll be ok. To anyone who prayed for him - thank you so much! I really appreciate it.