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I used to laugh at the idea of sunscreen for a dog, and then my sister's boxer came back from the beach with a nose like a burn. Not red. Blistered. The vet called it sunburn and said the pink part of a dog's nose has almost no protection, and a few hours of June sun had done what I would not have believed. I stopped laughing.
The reason it sounds silly is that most dogs are covered in fur, and fur is decent shade. But the places with no fur, or with white or thin fur, are exposed the way a bald scalp is. The nose. The ear rims. The belly on a dog that rolls onto its back. The spots around the eyes on a white dog. If the skin underneath is pink, it burns, and a burn on an animal that cannot tell you it hurts just gets worse quietly.
My own dog is a mixed breed with a pale muzzle, and after that beach story I started putting a dab of pet sunscreen on the pink strip down his nose before long walks in summer. The first time he sneezed it off inside of a minute, which was humbling. Now I do it right before we step outside and I rub it in well, and he tolerates it the way he tolerates nail trims, with resignation and a slight squint.
You cannot use human sunscreen. This is the part people miss. The zinc oxide and the salicylates that are fine on our skin are toxic to dogs if they lick them, and dogs lick their noses constantly. You need a formula made for pets, or at least one with no zinc and no ingestion risk, and honestly the pet-specific stuff is easier because it is meant to sit on fur and skin without a weird film. Ask your vet which brand they trust if you are unsure, because the market is full of things that claim to be gentle.
The cats in the house are a different puzzle. White cats with thin ears are the classic burn victims, and the edges of those ears can get damaged year after year until the vet starts talking about skin changes you do not want. I put a little sunscreen on the pale rims before the cat decides to sunbathe on the patio in July, and I keep those sessions short. A cat will sit in full sun until it is cooked, because cats are solar powered and have no sense of moderation about warmth.
The honest limit is that sunscreen is a backup, not a plan. Shade and timing matter more. We walk at seven in the morning now instead of noon, and the dog's favorite sniffing field has a line of trees I steer him under. Midday summer sun on pale skin, human or not, is the thing to avoid, and a tube of cream does not cancel that out. Use it for the exposed bits on a day you cannot avoid the open light.
I learned the hard way that the spray kinds are a bad idea near the face. The dog inhaled a mist once and coughed for a full minute while I panicked and then felt stupid. Stick or lotion, applied with a finger, is controllable. You cover the nose, the ear edges, any pink scar or patch, and you keep the dog from rubbing its face on the grass for sixty seconds so it can set. Sounds fussy. It is, and it is also two minutes that may save a vet trip.
One more thing about the belly. My dog loves to flop on his back in the sun, pink stomach up, and that skin is thin and burns fast. I either move him or smear a little protection there too, though he finds this deeply suspicious and tries to bite the hand. Worth it. The vet said repeat burns in the same spot are the ones to really watch, since damaged skin does not bounce back the way it used to.
Reapplication is not a one-and-done. A dog that swims or drools or rubs its face will take the layer off, and the protection goes with it. I keep a small tube in the walking bag for the beach dogs especially, and I do a second pass if we are out past an hour. The label on the pet bottle gives a time, but my rule is simpler, if he got wet, I put more on, and if I am unsure, I put more on.
If your pet already has a red, sore patch, do not just coat it and hope. That is a call to the clinic, because a burn can get infected, and an animal licking a raw spot makes it worse by the hour. Sunscreen is for prevention on healthy skin, not a treatment for something that already happened. I keep that line clear in my head so I do not talk myself out of a real visit.
He still suns himself every chance he gets. I just watch the clock now, and the pink parts get their dab before the door opens. The sister's boxer is fine, by the way, though his nose peeled for a week and he looked ashamed, which boxers do when they are uncomfortable. Mine will not have that story, if I can help it.