Activity tracker for dogs?

[Noitsnotteatimeyet]

I would love to know quite how much more ground my highly energetic dog covers than me during our walks - and how much he sleeps afterwards

Has anyone got any recommendations for Fitbit type things for dogs? It would absolutely need to be waterproof as he goes swimming most days and small and light enough not to annoy him

Thanks

Yes I trialled one called tractice motion.
It is similar to a basic fit bit, clips on the collar in a rubber outer. Links to your smart phone for tracking, I think it was pretty waterproof. I did cable tie it on for extra security. Bit gimicky but good fun.