We took our beagle Jamil paddling one day in Venice, just to try it. He sat in the rear hatch of my Rockpool Menai 18, with his own little canine PFD on. There are a few photos below.
Beagles aren’t usually fond of water, but he was calm enough for a short paddle. After about half an hour he got more restless, and after an hour we called it a day. I don’t think it was the water that bothered him, but rather the cramped space in the hatch, which didn’t allow him to change sitting position easily. The next time I’ll take one of the doubles to give him more room.