Ask most people whether dogs get sunburned and you’ll get one of two wrong answers: “no, they have fur” or “only white dogs.” The truth is more interesting and more useful. Dogs get two genuinely different sun injuries. One is the classic ultraviolet sunburn you already understand, and it hits pink, thin-coated, light-colored dogs. The other is a heat burn, a solar thermal injury, that specifically targets dogs with thick, dark coats, the exact dogs people assume are protected. Miss the second one and you’ll leave a black Lab exposed because you were only watching the white terrier.
This piece is built around that split, because the prevention and the warning signs are not the same for the two injuries. Understanding which dog is vulnerable to which kind of damage is the whole game.
Injury one: the classic UV sunburn
This is the one most like our own. Ultraviolet radiation from the sun damages the skin, and how badly depends on coat thickness, coat color, skin pigment, how long the dog is out, and the UV index at the time. The trap is timing: the first signs of a sunburn usually don’t appear until hours after exposure, and the full severity may not be clear for days. So “he was fine all afternoon” tells you nothing about whether he burned.
Signs of a UV sunburn on a dog include:
- Redness or pinkness of the skin, most visible on light-colored dogs and where the coat is thin.
- Dry, cracked, or flaky skin as the burn progresses. Dog skin sheds sun damage differently from ours, sometimes as dandruff-like flakes, sometimes as thick whitish or yellowish crusts, often chunkier than expected because dead skin catches in the fur before it sloughs.
- Hair loss in severely burned areas, from damaged follicles, and crusts that take hair with them as they peel.
- Pain when touched. Burns hurt. A sunburned dog may flinch from petting, hide, or seem stiff, sore, and grumpy.
- Blistering beneath the damaged surface, which dogs often rupture by licking or scratching before you see it.
- Skin cancer, over the long term. Repeated UV exposure damages skin-cell DNA, and every burn raises cancer risk. Dogs don’t typically get sun-driven melanoma the way people do, but they can develop cutaneous hemangiosarcoma or squamous cell carcinoma from sun damage.
The most vulnerable spots are the thin- or no-fur, low-pigment areas: the bridge of the nose, belly, inner thighs, ear tips, non-pigmented parts of the nose, lip edges, eyelids, and armpits. Scars, clipped surgical sites, vitiligo, allergic or parasite-damaged skin, areas of hair loss, and spots a dog chews bald all burn more readily too.
Injury two: the thermal burn that fools everyone
Here is the part that catches owners of dark, fluffy dogs off guard. Dark hair absorbs heat far more readily than light hair, and a thick coat traps it. In dogs with thick, dark coats that spend long stretches in direct sun, the coat can heat up enough to cause an actual thermal burn, a heat burn, generally running along the length of the back.
Solar thermal injury is sneaky in the worst way. Dogs often show no symptoms at the time of the injury, and severe burns can develop over days to weeks afterward. These are usually much more severe than a simple sunburn, can take weeks to heal, and may leave chronic scarring.
“People bring in a black-coated dog with a nasty burn along the spine and they’re baffled, because they were sure the dark fur was shading the skin,” says Dr. Lena Park. “It’s the opposite. That dark coat is soaking up heat and holding it against the skin like a lid on a pot. Thin, pale dogs and thick, dark dogs both need sun management, they just get hurt in different ways.”
Preventing both, without overthinking it
The good news is that a few habits protect against both injuries, since both come down to time in the sun and how much of it reaches the dog.
Limit exposure during peak hours. The simplest and most effective step is keeping dogs out of direct sun during the strongest part of the day, roughly 10 a.m. to 3 p.m. This helps with UV burns and with the heat that drives thermal injury.
Provide real shade. If your dog is outside on a sunny day, make sure there is a genuinely shaded spot to retreat to. Shade blocks most harmful UV and helps prevent overheating, which carries its own dangers.
Use a dog-safe sunscreen on the exposed spots. For thin-coated, light, or hairless dogs and any exposed pink skin, sunscreen is worth it. A good one protects against both UVA and UVB, is SPF 30 or higher, zinc-free, fragrance-free, quick-drying, and clear when applied. Dedicated dog sunscreens exist; a baby-safe spray-on can also work in a pinch, but read the label and avoid anything marked “harmful if ingested,” because your dog will absolutely lick it. Focus on the nose bridge, ear tips, belly, and any bald or pale patches.
Consider sun shirts for hairless breeds or dogs with large exposed areas, keeping in mind that clothing won’t cover every problem spot, so pair it with sunscreen on the gaps, and watch for overheating in an active dog wearing a shirt.
Treating a sunburn if it happens
Prevention is the goal, but know the response. If you think your dog is sunburned, take photos and call your vet’s office for guidance before trying treatments. To keep your dog comfortable while a mild burn heals, your vet may suggest:
- Cooling the area by wiping it with a cool, damp cloth or giving a quick cool bath, which reduces continued injury. Avoid ice packs and ice baths, which sharply cut blood flow to the skin and can cause further damage.
- Aloe vera or a pet-safe moisturizer on mild burns for a soothing, anti-inflammatory effect. Do not use it on severe burns or open wounds.
- Veterinary care if your dog is in pain, or if you see anything beyond mild pinkness. Other skin problems mimic sunburn, so a vet confirms the damage is what you think it is and helps it heal.
- Vet-prescribed pain relief. Your vet may prescribe an anti-inflammatory pain medication or ointment. Skip over-the-counter human sunburn products; many contain ingredients that are dangerous to dogs if licked.
What’s new since this was written
The most concrete recent update is about sunscreen, and it’s worth getting right. As of now, only one dog sunscreen, Epi-Pet K-9 Care Sunscreen, meets the FDA’s standards for pet sunscreen and is authorized for sale and use on pets in the United States. That doesn’t mean it’s the only usable option, plenty of vets still green-light a fragrance-free, zinc-free baby sunscreen for spot use, but if you want a product specifically vetted for dogs, that’s the one carrying that status.
The zinc-free guidance has also firmed up. Zinc oxide, the white paste in many human sunscreens, can cause zinc toxicity in dogs with repeated skin exposure and ingestion, damaging red blood cells, so veterinary and poison-control sources now consistently steer owners away from zinc-oxide products and away from human sunscreens containing certain salicylates. The practical rule that has emerged is simple: assume your dog will lick off whatever you apply, and choose a product that is safe when that happens. Everything else, shade, timing, and covering the pink spots, remains the backbone of sun safety, for both the pale dogs and the dark ones.
