Teach the exit before you enjoy the swim
Most water accidents happen not in the middle of a lake but at the edge, when a dog slips in, tires, or cannot find a way back out. Start at a shallow shore where he can walk in to belly depth and walk straight back out, let him paddle a short distance parallel to the bank with you beside him, and practise the exit again and again until he turns toward it without prompting. At a pool, guide him to the steps repeatedly and never allow swimming where the only exit is a vertical ladder or a steep bank. Block home pools, ponds and water troughs with fencing or covers when nobody is supervising, because a dog who falls in silently while chasing a ball or a frog may not be able to haul himself out, however strong a swimmer he is in a planned session.
Use a life jacket where depth, distance or fatigue add risk
A fitted canine life jacket is not an admission of a weak swimmer; it is the right gear for boats, paddleboards, deep lakes, rivers with any current, long swims and older or short-legged dogs who tire quickly. Fit it snugly so it cannot ride over his head or twist sideways, use the top handle to guide rather than drag him, and let him wear it for a few shore sessions before you rely on it afloat. Even in a jacket, stay close, keep swims short with long rests in shade, and end the session while he is still keen rather than exhausted. Never throw a reluctant dog into water to teach him, never let him swim out after birds or a thrown toy beyond an easy recall distance, and keep him on a long line in unfamiliar water until you know the bottom, the drop-offs and the exit points.
Respect currents, cold and what is in the water
Read the water as carefully as you read your dog. Avoid swimming after heavy rain when rivers run fast and banks crumble, keep him out of strong tides, weirs and canals with steep sides, and be cautious in cold water early and late in the year, since a chilled dog tires and panics faster. Discourage drinking large amounts of lake, sea or pool water during play, offer clean drinking water at every break, and rinse his coat and paws afterwards to remove salt, mud and pool chemicals. Dry his ears gently after swimming, especially if he is a breed with heavy, floppy ears, and watch over the next day for head shaking or ear scratching. If a swim involves a boat, rehearse the lift or ramp back aboard in shallow water first, so a real recovery is never your first attempt.
Act fast if a swim goes wrong
If your dog struggles, panics or goes under, get help and protect yourself first, because a drowning dog can climb and push down even a strong swimmer. Use a jacket handle, a lead, a branch or flotation to reach him from the bank or boat where you can, and once he is out, keep him warm, calm and still and contact a vet promptly if he has inhaled water, coughs repeatedly, breathes noisily, seems unusually tired, or was submerged at any point, even if he appears to recover on the bank. Those signs can worsen after the event, so do not wait until evening to decide. After any water scare away from home, his collar becomes the link back to you, and KinsLe Verified QR ID Pet Profiles mean anyone who finds a wet, collar-wearing dog can scan his QR and reach his profile and you straight away.