Part of Grey's physical therapy is swimming. Here are pictures of him in his life vest hanging out in the tub. He doesn't particularly like swimming, and he definitely doesn't care for the blow drying afterward. The Physical Therapist is going to lend Grey a tiny woofie cart to see if he likes wheeling around in it. If he does, then his Mom & Dad will get one for him. The way the carts are designed, the rear toes barely touch the ground, so this causes nerve stimulation in the feet which helps to regenerate those nerve endings.
Here is a picture of Grey on his specially designed Ham-Mick. It is a couple of inches taller than the ones Maw normally make so that Grey can look out his window all day while his beans are at work.