Sunshine always has a loose BM whenever we go for our outings involving water. Not so much if it is just dry woods running. After an hour and a half or so, she will just run off into the woods, go and come screaming back for more action. It is just a small fraction of a regular BM. If we go for a quick trip (less than an hour) I might have to remind her before we get back in the car. "Sunshine, last call for poop & pee." ZOOM! Off into the woods or tall grass, TCOB and RUN right back.
Up until after 2 years old, she would also pee.. a LOT! We are talking every 10 minutes or so. I believe she just didn't catch on to not swallowing a ton of water while swimming. There is no bashfulness about peeing. She will be on the way back with a retrieve, stop, drop the object, squat, pick it back up; and RUN back to me.