Why pH matters more than any ingredient

Skin protects itself with something called the acid mantle: a thin film of sebum, sweat and fatty acids that holds water in and keeps opportunistic bacteria from settling. It works because it is slightly acidic, and it only rebuilds properly if whatever you wash with leaves it roughly where it was.

Human skin runs near pH 5.5. Dog skin runs close to neutral, usually between 6.5 and 7.5 depending on breed and coat. Cats sit a little lower, around 6.2. Because pH is a logarithmic scale, the gap between 5.5 and 7.0 is not a small one: it is roughly a thirty-fold difference in hydrogen ion concentration.

What goes wrong, and how slowly

One bath in the wrong thing does nothing you would notice. The damage is cumulative. Over a year of monthly washing in an over-acidic formula, the mantle spends more time rebuilding than intact. The coat loses its shine first, then the skin flakes, then the dog starts scratching, and by then almost nobody connects it back to the shampoo.

The same is true in the other direction. Bar soap and washing-up liquid land around pH 9 to 10, which strips the mantle completely. Washing-up liquid is a genuinely common emergency choice for a muddy dog, and it is one of the worst things in the house for the purpose.

What to look for

A responsible pet product states its pH, or at minimum states that it is pH-balanced for the species on the label. “Gentle”, “natural” and “hypoallergenic” are not regulated claims and tell you nothing about acidity. If the number is not printed anywhere, assume nobody measured it.

Two things that are not the same: a product formulated at the right pH, and a product that merely does not sting. Plenty of neutral-feeling shampoos are built on a human base and corrected with a little citric acid at the end, which shifts the number without changing the surfactants doing the stripping.

Where we sit

Every Pawélle wash-off product is developed towards the pH 6.2 to 7.2 band, which covers both cats and dogs. Final measured values will be printed on each product page once formulas are confirmed. The balm has no pH, because it is anhydrous — there is no water in it for acidity to be measured in.