"Any ideas? Can anyone suggest a safer toy with similar qualities, since this seems to appeal to him? (I'm considering making a "rubber band ball" for him to bat around...would that make a safe cat toy, if it were big enough to not be swallowed? Am I missing anything obvious?) "
We had the same problem with Stinky Luna. She found a rubber band somewhere and had an absolute blast with it until she of course ate it, then barfed it up all over H's shirt. (The shirt was in the dirty laundry, not on him.) Both our cats love milk rings, but again, Stinky will chew them into tiny bits and eat them. After some experimentation, we've found that baby teething toys work nicely- There are some sturdy plastic rings that come in a set, specifically for kids to chew on, (not the gel filled ones) that Stinky likes. They offer a little resistance, like a rubber band, but are still hard enough that she can't chew it to pieces. If you can find a set of plastic keys on a ring, she also likes the ring off of that. Currently they're both on a "let eat plastic bags" kick that we're trying to discourage. S.