Took this during Mr. Mick's out-and-about time tonight:
I had forgotten about this treatball until recently, when I saw an article about a similar toy and realized that I could use Mick's papaya and pineapple mini-bits in the one I had. Of course being that treats were involved, he figured it out pretty quickly. Usually, he just picks it up and flings it until all the bits are out, but this time, he finally used it as he's supposed to.
He is doing quite well; the lump where the abscess was seems to be getting smaller and does not feel like it's filling up with ick again. We are keeping fingers and paws crossed for a clean bill of health when we see his vet again on the 10th.