What a cutie - just want to hug him! ;)
Thank you so much for the kind words! I really appreciate the advice in this thread and through PM's on what to do about his knees. I'm confident that he'll see not only an increase in strength but an increase in energy too as I continue taking him on walks. The foster parents said they didn't take him on many walks so this is a brand new thing for him. He's really enjoying them so far. He's constantly looking around and sniffing things, but still just as easy going as ever.
Here's a picture my girlfriend took last night of him and I. We were watching an episode of Game of Thrones on the comfy reclining couch and decided to put his beanbag bed in the middle of us. He kinda rolled half off of it and onto me. If you look closely you can even see him using his stuffed mouse a pillow. :)