For all that I totally understand and love the flea collar on pastern thing - did the pet store think you had a bunch of dogs? a dashchund kennel? I'd still put the ID on my horse's headstall. It's right at the rescuer's eye level, specific to the individual horse (unlike the saddle), somewhat less likely to get lost, and is a logical place for such stuff. How many people would think to look for ID on a pastern? Not me, or anyone I know.
Come to think of it, maybe it's time to check the dogs name tag. There's a lot of action there, too, and this thread has me wondering if the info is still legible on Monty's tag.
Oh, Monnnntyyyy...
(It's OK, but the dog is confused "What was THAT all about?")
Give big space to the festive dog that make sport in the roadway. Avoid entanglement with your wheel spoke.
(Sign in Japan)
1978 Raleigh Gran Prix
2003 EZ Sport AX