As I couldn't think of another use for one but am curious to try one out, I have just ordered an AirTag along with a Belkin holder to attach it to my guide dog's collar.
I've never lost one of my guide dogs before, but curiosity got the better of me and this was the best use case that I could sort of justify to myself ☺️
At the very least I will be curious to discover whether the Precision Finding feature of the AirTag has enough range to give me some idea of where my dog is when he's free running at the park. If the range is 10 foot or less, then I have probably already got that covered. But, anything more and this might be useful.
Yeah, I know, all of the above is pure justification for buying something that I don't really need 😉