UPF 50+ Dog Clothing Explained: How Sun-Protective Fabric Works for Thin-Coated Dogs
UPF dog clothing is made from fabric that has been rated for how much ultraviolet radiation it lets through to the skin. A UPF 50+ fabric lets through no more than about 1/50 of the sun's UV, which is why it is described as blocking about 98 percent. For a light-skinned, thin-coated dog such as an Italian Greyhound or a whippet, that rating is the difference between a shirt that looks summery and one that actually shades the skin underneath. Here is how the rating works, how fabric is tested, why sighthounds burn, and how to choose coverage.
Key takeaways
- UPF measures how much UVA and UVB passes through a fabric; SPF is a sunscreen rating based on UVB.
- UPF 50+ means 1/50 of the UV or less gets through, about 98 percent blocked.
- Stretching and getting wet can lower a fabric's protection, so fit and drying time matter.
- Coverage decides what is protected: a vest shades the back and chest, a full bodysuit adds the legs, and nothing covers the nose.
What UPF Means, and How It Differs From SPF
The Skin Cancer Foundation's guide to sun-protective clothing defines UPF, or Ultraviolet Protection Factor, as a measure of how much UV radiation (both UVB and UVA) a fabric allows to reach the skin. A UPF 50 fabric blocks 98 percent of the sun's rays and lets 2 percent, or 1/50th, through. SPF, the number on a sunscreen bottle, is based on how long it takes UV-exposed skin to redden, and it measures UVB only.
The Foundation rates UPF 30 to 49 as very good protection and UPF 50+ as excellent, and a fabric must reach UPF 50 to earn its Seal of Recommendation. A label that reads UPF 50+ tells you the fabric rated at 50 or higher.
The easiest way to understand the number is to flip it into the share of UV that gets through:
| Fabric | UPF | Share of UV reaching skin |
|---|---|---|
| White T-shirt, wet | About 3 | About 1 in 3 |
| White T-shirt, dry | About 7 | About 1 in 7 |
| UPF 30 fabric | 30 | About 1 in 30 |
| UPF 50+ fabric | 50 or more | 1 in 50 or less |
The T-shirt figures come from the Skin Cancer Foundation, and the last column is simply 1 divided by the UPF. That gap is why an ordinary light tee is not the same thing as sun protective dog clothes.
How UPF Fabric Is Tested and Labeled
The US standard for UPF labeling is ASTM D6603, the Standard Specification for Labeling of UV-Protective Textiles. It covers labeling for textile products intended to protect people from UVA and UVB radiation, and it bases labeling on UV-protection data collected by instrumental methods.
The measurement itself is described in AATCC Test Method 183, which determines the UV radiation blocked or transmitted by fabrics intended for UV protection and points to ASTM D6603 for labeling. In plain terms, a spectrophotometer or spectroradiometer measures UV with and without a fabric sample in the way, weighted toward the wavelengths that redden skin. The ratio of the two readings is the UPF, and the method also calculates the percent of UVA and UVB blocked. Specimens can be tested dry or wet.
Those standards were written for clothing worn by people. A fabric blocks UV the same way whoever is wearing it, so the rating describes the fabric itself; the cut and fit of a dog garment decide how much skin it actually shades.
Our UV pieces are labeled UPF 50+. The bodysuit listings describe the fabric as tested to block at least 98 percent of the sun's UVA and UVB rays, made of 84 percent polyester and 16 percent spandex for lots of stretch, with a wicking finish that helps move moisture off the skin. You can see every print on our UV Sun Fabric page.
What Changes a Fabric's Protection: Color, Weave, Stretch and Water
A UPF rating is measured on a specific fabric in a specific condition. The Skin Cancer Foundation lists the factors that push protection up or down:
- Color. Dark or bright colors absorb UV rather than letting it pass, while lighter shades protect less.
- Construction. Densely woven cloth, such as denim, canvas, wool or synthetic fiber, protects more than sheer, thin or loosely woven cloth.
- Fiber. Shiny polyesters can be highly protective because they reflect radiation.
- Stretch. When fabric is stretched, the fibers pull away from each other and let more UV through.
- Water. Wet clothing loses some protective ability, as the T-shirt numbers above show.
Stretch is the one dog owners can control most. Dog bodysuits fit close to the body by design, and our ready to wear UV vests have a 4-way stretch that keeps them comfortable for active dogs. A garment that is too small gets pulled thin across the chest and back, so choose the size your measurements call for rather than sizing down. Our 4-step measuring guide and the size guide will get you there; read the size details in each product description too.
On water: our ready to wear UV vests are described as drying quickly when they get wet, and the Long Sleeved UV Tops listing notes they can be put in water first for a cooling effect. On a long beach or lake day, still plan shade breaks, since fabrics in general can lose some protection while wet.
Why Light-Skinned, Thin-Coated Dogs Burn
Dog sunburn is not a cosmetic problem. VCA Animal Hospitals explains in its article on solar dermatitis in dogs that sun damage occurs mainly in dogs with white or pale patches of skin and is more common in white-haired, short-coated breeds, a list that includes the whippet. Commonly affected areas include the flanks, groin, armpits, top of the nose and eyelids, plus the sides of the trunk and the outside of the legs. A dog that likes to lie on one side tends to show more damage on the side facing the sun. VCA notes the condition may progress to a skin cancer called squamous cell carcinoma.
PetMD's veterinarian-written guide, Can Dogs Get a Sunburn?, adds that burns are more common in dogs with thinner coats, white dogs, hairless dogs and dogs with lighter skin, and it names Chinese Cresteds, Greyhounds and Whippets among the prone breeds. It points to the nose, ear flaps, belly, groin, hindquarters and the skin around the eyes, and warns that reflective surfaces such as a large body of water raise the risk. The AKC's summer guide likewise says that fine-coated breeds such as Greyhounds are more prone to sunburn.
We cover the everyday case for sun tops in our post on the 5 benefits of UV blocking tops for Italian Greyhounds, so this post sticks to how the fabric works. If you see redness, flaking or sores that do not heal, see your veterinarian, and VCA warns never to use a human sunscreen on a dog without checking with your vet first.
Choosing Coverage: Vest, Capri Bodysuit, Full Bodysuit or Bucket Hat
Every UPF 50+ piece is rated to block about 98 percent of UV or more wherever it covers. What differs is how much skin each style covers:
| Style | Covers | Leaves exposed |
|---|---|---|
| Sleeveless UV vest | Back, chest and neck | Legs |
| Rash shirt with 3/4 sleeves | Back, chest and upper front legs | Back legs |
| Capri bodysuit | Back, chest and the upper part of all four legs | Lower legs |
| Full-length bodysuit | Back, chest and all four legs | Head and feet |
| Bucket hat | Top of the head and ears | Nose and body |
Vests and turtlenecks
Our ready to wear Small UV Sleeveless Vests (also in medium and large) are sleeveless turtlenecks in UPF 50+ fabric, finished with soft fold over elastic around the arms. The Custom UV Dinosaur Sleeveless Turtle Necks add dino scale prints. A vest is the lightest option and an easy pick for dogs who are only out in the sun for short stretches.
Rash shirts
The Custom UV 50+ Baseball Style Rash Shirts cover the back and chest with 3/4 sleeves, and you can ask about a higher collar for more neck protection. The listing notes the fabric dries quickly and does not weigh a dog down after it gets wet, which is why it suits beach days.
UV bodysuits for dogs
Bodysuits cover the flanks and the outside of the legs, two of the areas VCA lists. Our Ready to Wear UPF+50 Capri Length Bodysuits have short capri legs with a wider cuff, which also suits dogs with shorter legs. For the most coverage, the Custom UV 50+ Bodysuit with full length coverage on all 4 legs covers all four legs in full. Both have no snaps, Velcro or buckles and slip on over the head. Bodysuits also come up after surgery, and our recovery suit vs cone comparison explains when your vet might choose one.
Bucket hats
Our Custom Bucket Hats made from UPF 50+ fabric add protection for a sensitive head and ears, with an adjustable elastic band under the chin. They are sized for Italian Greyhounds. No garment covers the nose, so ask your veterinarian about a dog-safe sunscreen for that spot; VCA suggests applying sunscreen to thinly haired areas where a dog cannot easily lick it off.
Caring for UPF Dog Clothing
Our UV bodysuit listings say hanging or laying flat to air dry is best, with a low dryer setting only if you must use a dryer. Wash in cold water with a mild detergent, like the rest of our pieces. Because stretching reduces protection, retire a UV piece that has been pulled out of shape. For more on every fabric we use, see our guide to how to wash dog clothes.
Frequently Asked Questions
Is UPF the same as SPF?
No. UPF rates fabric and covers both UVA and UVB, while SPF rates sunscreen and is based on UVB-caused reddening, according to the Skin Cancer Foundation. A UPF 50 fabric lets about 1/50 of UV through.
What UPF rating should dog clothing have?
The Skin Cancer Foundation rates UPF 30 to 49 as very good and UPF 50+ as excellent, and it requires UPF 50 for its seal. Our UV line is labeled UPF 50+.
Does a regular T-shirt protect my dog from the sun?
Only a little. The Skin Cancer Foundation puts a white T-shirt at about UPF 7, dropping to about UPF 3 when wet. A UPF 50+ shirt lets through far less UV.
Does my dog still need sunscreen with a UV shirt?
Possibly, for the parts clothing cannot cover, such as the nose and ear tips. Ask your veterinarian which product is safe, because VCA warns against using human sunscreen on dogs without a vet's approval.
Can whippets and greyhounds wear UV bodysuits?
Yes. Our Custom UV Sleeveless T-Shirts and Turtle Necks are offered for larger pups, whippets and greyhounds, and the listing asks for a second fabric choice in case there is not enough of the first. For a full bodysuit on a big dog, use the custom quote form.
Shop UPF 50+ Pieces for Your Sighthound
Browse the full UV collection for custom vests, rash shirts, bodysuits and bucket hats, or the UV Ready to Wear collection for pieces that ship the next business day. If you are building a warm-weather wardrobe, our guide to Italian Greyhound summer clothes puts UV pieces alongside light tees, and owners of bare-skinned breeds should read our post on clothes for hairless dogs.
Sources and Further Reading
- Skin Cancer Foundation: Sun-Protective Clothing
- ASTM International: D6603 Standard Specification for Labeling of UV-Protective Textiles
- AATCC: Test Method 183, Transmittance or Blocking of UV Radiation through Fabric
- VCA Animal Hospitals: Solar Dermatitis in Dogs
- PetMD: Can Dogs Get a Sunburn?
- American Kennel Club: How to Keep Your Dog Cool in Summer