Why human shampoo is wrong for dogs
We are often asked whether baby shampoo is not mild enough for a dog. It is not, and the reason is not mildness but the chemistry of the skin.
Different pH
Human skin is acidic, around pH 5.5. Dog skin is closer to neutral and usually has a higher pH than ours, with variation by breed, age and body area. Human shampoos are made for acidic skin. On dog skin they disrupt the acid mantle, the thin layer that protects against bacteria and fungi.
Thinner skin
A dog's epidermis is much thinner than ours. Anything that dries or irritates works faster and deeper. The coat shields the skin from the outside, but during a wash the product reaches the skin directly.
What happens in practice
After one bath there is usually no visible change, although sensitive skin can react to a single wash. With regular use the skin gets dry, dandruff appears, the dog starts scratching, and the broken barrier opens the door to bacterial and fungal infections, which show up as smell and a greasy coat. Then the owner bathes more often and the circle closes.
What to look for in a dog shampoo
- A pH matched to dog skin (the manufacturer states it on the label)
- Mild surfactants, no SLS/SLES
- Preferably no silicones: the shine they give is surface-level and is not skin care
- No synthetic fragrance: a dog's nose is far more sensitive than yours
- A full ingredient list on the label, published by the manufacturer
What if I have already done it
Stop using human shampoo and use a mild shampoo for sensitive skin at the next bath. If the skin is red or flaky, or the dog is scratching, have a vet look at it before you only switch products. Without such signs the skin usually recovers on its own.
General care information, not veterinary advice. For wounds, severe itching or hair loss, see a vet.
