Mountain Lake Swimming and Post-Swim Care for Dogs

Cedar loves mountain lakes. The colder the better. At twelve years old, she still charges into alpine water like a puppy spotting her first squirrel. But what happens after she climbs out matters just as much as the swim itself. We learned this the hard way after a camping trip to Glacier National Park left her with an ear infection that took three vet visits to clear.

Post-swim care takes five minutes. Skip it and you risk ear infections, skin irritation, or worse. A quick routine after every swim keeps your dog comfortable for the rest of the trip.

Why post-swim care matters

Mountain lake water looks pristine. Cold, clear, tumbling down from snowfields. Beautiful. But that crystalline appearance hides something less pleasant. Giardia and leptospirosis thrive in alpine water that seems impossibly clean, and elk and deer upstream contaminate sources in ways you'll never see from your spot on the shore.

The bigger risk for most dogs comes after they leave the water. Moisture trapped in ear canals sits warm and dark. Bacteria and yeast love it. They multiply fast. Dogs with floppy ears face the worst odds because Golden Retrievers, Labs, and Spaniels have ear structures that seal moisture in like a lid on a jar.

Water temperature matters too. Alpine lakes run cold. Even in August, many sit below 60°F. A wet dog loses body heat four times faster than a dry one, and young dogs, seniors, and lean breeds feel that chill hard.

Cedar taught us this the hard way. Those five minutes after swimming make a real difference. We've seen what happens when we rush through it or skip steps entirely.

The complete post-swim checklist

We run through this checklist after every swim. Takes longer to read than to actually do it.

Step 1. Get out the towel immediately. Before anything else, start drying. Head to tail. Pay attention to the chest and belly where water pools. Microfiber camp towels work well. They absorb more water per square inch than cotton and pack down small.

Step 2. Shake it out. Let your dog shake. They will anyway, so step back and give them space. The shake reflex removes a surprising amount of water from the coat. Some owners try to stop the shake to avoid getting wet themselves. Don't. The shake does more for your dog than the first towel pass.

Step 3. Dry the ears thoroughly. Lift each ear flap and wipe the inner surface with a clean, dry cloth. Gently insert a cotton ball into the ear canal entrance and let it absorb moisture. Never push anything deep into the ear. The outer portion is what you can safely reach.

Step 4. Apply ear drying solution. A vet-approved drying solution evaporates remaining moisture. We use one with a gentle acidifying agent that discourages bacterial growth. Squirt a small amount into each ear. Massage the base for 15 to 20 seconds. Let your dog shake again.

Step 5. Check between the toes. Water sits between paw pads and toes. Spread each toe and dry the webbing. This prevents the soggy conditions that lead to yeast infections between the digits.

Step 6. Inspect for debris. Swimming stirs up silt, algae, and plant matter. Check your dog's coat for hitchhikers. Remove any visible debris before it dries and mats into the fur.

Step 7. Offer fresh water. After a swim, dogs want to drink. Give them clean water so they won't lap from the lake again. Dehydration adds stress on top of everything else.

Ear infections and how to prevent them

Swimmer's ear in dogs follows a predictable pattern. Water enters the ear canal. The L-shaped structure traps it there. Warmth and darkness do the rest. Bacteria or yeast multiply, and within days, infection sets in.

You'll notice head shaking first. Then scratching at ears. Red tissue follows, maybe dark discharge, and eventually that yeasty smell you can catch from across the room. By the time you notice that smell, infection has already set in. Treating an established ear infection means vet visits and weeks of medication. Prevention takes thirty seconds.

We clean Cedar's ears after every water exposure. The combination of drying plus an ear solution has kept her infection-free for three years running after that initial problem at Glacier. Her vet recommended a solution containing acetic acid, which creates an inhospitable environment for the organisms that cause trouble.

Dogs with upright ears drain water more naturally. German Shepherds and similar breeds rarely develop swimmer's ear. Floppy-eared breeds need active intervention every single time they swim.

Cold water and hypothermia risk

Mountain lakes stay cold. Surface water may feel swimmable, but anything below 50°F poses real hypothermia risk. Smaller dogs and those who swim for extended periods face the worst exposure.

Signs start subtle. Shivering that persists after drying. Reluctance to move. You might notice pale gums or slow responses to commands that usually get an instant reaction. Advanced hypothermia brings muscle stiffness and shallow breathing. At that point, you need emergency veterinary care.

Prevention centers on limiting swim time in cold water and drying quickly afterward. For Cedar, we allow swimming for five to ten minutes maximum in alpine lakes, then get her out and dried before chill sets in. At her age, she's more susceptible than a younger dog would be.

Wet fur loses almost all its insulating capacity. A dog who seems fine while swimming can crash fast once out of the water if ambient temperatures are low. Wind speeds heat loss. High altitude makes everything worse because temperatures drop and wind picks up.

Bring an extra layer. A lightweight fleece jacket or insulated vest helps trap body heat during the drying process. We carry one for Cedar on any trip where swimming is likely.

Waterborne illness concerns

Not every swim leads to illness. Most don't, honestly. But the risks exist and knowing what to watch for can save you a scary vet visit later.

Leptospirosis spreads through contaminated water, especially in areas where wildlife urinate into the source. Infection can cause kidney failure, liver damage, and death if untreated. Vaccination helps but doesn't provide complete protection. Watch for fever, muscle tenderness, vomiting, and changes in urination patterns.

Giardia lives in cold, clear mountain streams and lakes. Dogs contract it by drinking contaminated water or swallowing it while swimming. Symptoms typically appear days later. Watery diarrhea is the most common sign, often with gas and sometimes dehydration if it goes untreated.

Blue-green algae blooms present the most acute danger. These cyanobacteria can kill dogs within hours of exposure. Blooms occur more often in warm, still water, but mountain lakes are not immune during warm summers.

We can't eliminate these risks. We can only minimize them. Offer fresh water frequently so your dog doesn't drink from the lake. Know the signs of illness and watch for them in the days after a swim. Keep leptospirosis vaccinations current.

Coat care for swimming dogs

Wet fur that dries wrong causes problems beyond discomfort. Matting develops when damp hair tangles and compresses against itself. Once matted, fur loses its insulating properties entirely. Worse still, it holds moisture against the skin and creates the perfect environment for hot spots and bacterial skin infections to develop.

Double-coated breeds need more work. The dense undercoat that protects them from cold also traps water close to the skin. Quick surface drying leaves moisture hidden below. With Huskies, Malamutes, and Golden Retrievers, you have to work the towel deep into the coat to reach that undercoat.

Blow drying at camp isn't practical, but you can improve drying with airflow. Position your dog in a sunny, breezy spot while you set up camp or eat lunch. Movement helps too. A post-swim walk generates body heat that evaporates moisture from the inside out.

After a swim day, we brush Cedar's coat once it's fully dry. This removes any debris we missed during the initial inspection and prevents tangles from setting in. Her feathered legs and chest hold the most moisture and need the most attention.

Repeated swimming in natural water strips coat oils over time. Some owners rinse their dogs with fresh water after lake swims to remove minerals and organic matter. We do this when we have extra water, especially after lakes with high algae content or obvious particulate matter floating around.

Building the post-swim routine

The routine doesn't need to be perfect. What matters is doing it. A simple process you follow every time beats an elaborate protocol you skip when tired.

Our post-swim process runs the same order every time. Towel dry, shake, ear clean, ear solution, paw check, debris check, fresh water. Always that order. Cedar knows the drill now and sits still for ear cleaning because she's done it so many times. The repetition built that cooperation over months of practice.

Keep supplies accessible. We store the swim kit in an outer pocket of the pack so we don't have to dig for it. The easier you make the routine, the more likely you are to do it completely.

Make it part of the hike rhythm. Swimming happens, then post-swim care happens, then the hike continues. Treat it as one connected event rather than an interruption.

If you hike with multiple dogs, develop a system. We've seen groups where each hiker handles one dog's post-swim routine. The key is assigning responsibility so no dog gets skipped.

When to see a vet

Most post-swim issues resolve with proper care. Some don't, and knowing when to call the vet matters.

See your vet if head shaking or ear scratching persists more than a day after swimming. Discharge from ears or eyes warrants evaluation. Diarrhea lasting more than 48 hours after lake exposure could indicate giardia or another waterborne infection.

Lethargy or behavior changes in the days after a swim deserve attention. Leptospirosis and other serious infections present subtly at first, and by the time symptoms become obvious, you've lost valuable treatment time. When Cedar seems off after a water-heavy trip, we don't wait to see if it resolves. We call the vet.

Skin problems sometimes show up days later. Hot spots, areas of red irritated skin, and excessive licking or chewing at one body part suggest something brewing. Moisture trapped against skin from inadequate drying often drives these issues.

For the complete post-hike routine that includes tick checking, add another five minutes to your protocol. Swimming dogs pick up ticks like any others, and wet fur can make them harder to spot during the initial check.