A cat's weight-bearing pad is 3 to 5 mm of fat and elastic fibre under a keratin layer several times thicker than the skin on its flank. It absorbs shock, grips smooth floors and carries the only sweat glands a cat has, yet removes under 5% of body heat. A pad is a shock absorber, not a radiator, and at 50°C ground temperature damage can begin inside 60 seconds.
Three numbers carry the subject: 3 to 5 mm of cushion, under 5% of cooling, 60 seconds at 50°C.
Twenty-two pads, one job
Count them: 4 digital pads on each of 4 paws gives 16, 1 metacarpal pad per forepaw and 1 metatarsal pad per hind paw add 4, and 1 carpal pad on the back of each foreleg adds 2. That is 22 pads, and only the 2 carpal pads normally miss the ground. They touch down when a cat brakes on a descent, which is why they sit higher and wear less.
Cats are digitigrade: the heel never meets the floor, so body weight passes through 4 small pads per paw, with the front pair taking roughly 60% at a standstill. Land a cat from 1.5 m and the digital cushions flatten, spread the impact and spring back. That is why a cat crossing tile at 4 km/h is almost silent.
What the cross-section shows
Under the surface: a cornified layer far thicker than haired skin, a dermis packed with eccrine sweat glands, then the digital cushion itself, fat lobules in a mesh of collagen and elastin tied to the distal phalanx. The bearing surface has no hair follicles and no sebaceous glands, so the pad cannot oil itself. It stays supple on moisture from its own ducts.
The glands are the part most owners misread. Eccrine coils reach their highest density under the metacarpal pad and sit at lower density under the digital pads, and they reach the surface nowhere else, so the pad is the only place a cat can sweat. The secretion forms a film a few micrometres deep that raises friction on smooth floors: a grip layer first, a cooling layer a distant second.
Why the pad cools almost nothing
Under 5% of resting heat loss leaves through the pads; radiation and convection from trunk and ears carry most of the rest. Pad blood flow is low at rest, the keratin insulates, and pad surface temperature tracks ground temperature within a degree or two instead of the core 38 to 39°C.
What cools a cat instead: vasodilation of the ear pinnae, stretching on cool tile, moving air, and panting once ambient temperature passes about 32°C. Wetting paws buys a few minutes at best. For a cat in a 35°C room, use water at 20 to 25°C on the ears and belly, a fan moving 0.5 m/s, and a shaded floor.
The 50°C ground rule
Asphalt runs far hotter than the air above it. On a 30°C day in sun, dark asphalt commonly measures 50 to 60°C; at 35°C air it can pass 65°C. Pad tissue begins to suffer near 50°C. Press the back of your hand to the surface for 5 seconds: if you want to lift it, the ground is too hot for 4 pads carrying 60% of the load.
| Ground surface | Back-of-hand test, 5 s | Safe standing time | What happens |
|---|---|---|---|
| 40°C | Comfortable | No practical limit | Nothing |
| 45°C | Warm but holdable | Under 5 min | Pad feels hot, no damage |
| 50°C | Uncomfortable by 3 s | Under 60 s | Redness, first cell damage |
| 55°C | Painful | 15 to 30 s | Superficial burn likely |
| 60°C | Cannot hold 1 s | Under 5 s | Blistering within minutes |
| 65°C | Immediate pain | About 1 s | Deep burn risk |
Timing matters as much as temperature. Walk before 10:00 or after 19:00 in summer, keep to grass and shade, and carry the cat across the 20 m of dark car park between door and kerb.
Healing runs on a slow clock
Pad tissue heals slowly: no hair follicles, few vessels for its thickness, and a keratin layer no dressing can replace. A superficial abrasion closes in 7 to 10 days. A full-thickness laceration takes 3 to 6 weeks, with sutures out at 10 to 14 days and bandage changes every 24 to 48 hours. Contamination left 48 hours untreated adds roughly a week.
See a vet the same day for a cut longer than 5 mm, a wound deeper than the keratin, or a cat that will not put the paw down for 12 hours. A single swollen paw is a different problem: foreign body, abscess or tumour all present that way.
Chewing is rarely about the pad itself
Licking and chewing at pads is a symptom. Flea allergy, food allergy, Malassezia overgrowth, a grass awn between the toes and referred arthritis pain all look similar from 1 m away. More than 2 or 3 bouts a day, hair loss between the pads or brown staining points to allergy or infection rather than boredom.
Winter adds causes. De-icing salt left on for 10 to 15 minutes irritates the skin between the toes; rinse with water at 25 to 30°C and dry, do not let the cat lick it off. Ethylene glycol antifreeze is worse: as little as 1 to 2 mL/kg can be fatal, and treatment must start within 3 hours.
Five checks that take a minute
- Look at all 22 pads, including the 2 carpal pads on the back of the forelegs, which owners miss most often.
- Press each pad with a thumb for 2 seconds: heat, tenderness or a soft spot means a problem under the surface.
- Spread the toes and check the 4 interdigital spaces per paw for awns, salt or chewed fur.
- Watch the cat walk 3 m on a hard floor: a shortened stride on one side is the earliest sign of pain.
- Weigh monthly; cats past 11 years lose pad fat and need softer ground.
Age changes the numbers: a 12-year-old cat has less fat in the digital cushion and thinner keratin than a 2-year-old, so the same 50°C pavement is a real burn risk. Use the cat age chart to see where your cat sits. If chewing has started, work through causes in order rather than reaching for a cream: fleas, then food, then a vet check. The paw chewing guide maps each pattern to a cause.
Terms mentioned in this article
Frequently asked
How thick is a cat's paw pad and what is it made of?
A weight-bearing digital pad is 3 to 5 mm of fat held in a mesh of collagen and elastic fibre, covered by a keratin layer several times thicker than haired skin. The metacarpal pad is the thickest of the 22 pads, and the surface has no hair follicles or sebaceous glands, so it stays supple from its own sweat ducts and ground contact.
Do cats sweat through their paw pads, and does that cool them?
Yes, the pads hold the only eccrine sweat glands that open to the skin surface, so a nervous cat leaves damp prints. The cooling effect is small: under 5% of resting heat loss leaves through the pads. Ear vasodilation, cool floors, moving air and panting above roughly 32°C do most of the work, which is why wetting paws is not a real cooling plan.
How hot is too hot for a cat to walk on?
Treat 50°C as the line. Press the back of your hand to the ground for 5 seconds; if you want to lift it, the surface is too hot. At 50°C damage can begin within 60 seconds, at 55°C within 15 to 30 seconds, and at 60°C within 5 seconds. Walk early or late in summer and carry the cat over dark asphalt.