The Gap Happens Exactly When Risk Peaks
Campsite logic removes the collar for good reasons — a wet collar rubs, a swimming dog can snag it, and it needs drying overnight. But the collar comes off at precisely the moments a dog is most likely to vanish: plunging into a lake after a duck, bolting from a tent at a firework, or slipping a lead on the way back from the water in the dark, damp and without the one thing that names him. Identification that only exists on the dry collar by your sleeping bag is identification he does not have when he needs it.
Give Him Swimwear Identification of His Own
The simplest fix is a dedicated water collar or lightweight harness that goes on for swimming and stays on until he is dry and settled. It should be quick-drying, fitted so it cannot slip over his head when wet, and carry its own securely attached tag rather than borrowing the dry collar's. A harness has the extra virtue of a handle and a lead point if he needs guiding out of the water. Check the fit after the first swim of the trip — wet webbing stretches, and a collar that was snug at breakfast can be loose by the evening swim.
Make the Tag Speak Campsite, Not Just Home
His home tag tells a finder your address; a campsite finder needs your pitch number, the site's name, and the mobile in your pocket. Add a temporary second tag for the trip with those details, and consider writing your number on the swim collar itself in permanent marker as a third layer. If he is found by site staff, the office should already hold your number and a description — leave both when you check in, along with which pitch you are on and what vehicle is yours, because on a large site 'the people with the brown dog' describes half the field.
Cover the Hours Around the Tent Too
Most campsite escapes happen at the tent, not the lake. Keep him on a long line or tether at the pitch if local rules allow, zip the tent inner fully even for short naps, and fit the dry collar with its main tag the moment swimming ends for the day — make it part of the towel-down routine rather than a separate chore to remember. Note where the nearest vet and the site's out-of-hours contact are before you need them, and keep a recent photo of him on your phone, wet as well as dry, because a soaked dog looks like a different animal to a stranger.
A Code That Works on a Dripping Dog
Reading small engraved letters on a wet, wriggling dog by torchlight is nobody's strength. KinsLe Verified QR ID Pet Profiles put his unique scannable code on that swim collar, so a finder at the lake can open his profile and message you on the number you are actually carrying.