Why shampoo pH matters for your pet's skin

When we choose a shampoo for our pets, we usually pay attention to the scent, texture or brand. But there is one factor that actually determines whether a shampoo will be safe for your pet's skin, and that is its pH level. The wrong pH can lead to serious dermatological problems, even if the shampoo looks and smells great.

What pH is and why it matters

pH (potential of hydrogen) is a scale from 0 to 14 that measures how acidic or alkaline a substance is:

• 0-6.9 is acidic (lemon juice, vinegar)
• 7.0 is neutral (pure water)
• 7.1-14 is alkaline (soap, bleach)

The skin of every living creature has its own natural pH level, which forms what is known as the acid mantle (a thin protective layer on the surface of the skin). This mantle performs critically important functions:

• Protects against bacteria, fungi and viruses
• Keeps moisture in the skin
• Supports healthy microflora
• Maintains the skin's barrier function

Pet skin pH vs human skin pH

Here is the key difference that many pet owners don't realise:

As you can see, the difference between human and pet skin pH can be 1.5-2 units. That may not seem like much, but the pH scale is logarithmic. This means that each unit of difference is a 10-fold change in acidity. So a difference of 2 units already makes the environment 100 times different.

What happens when the pH is wrong

When you use a product with the wrong pH, the skin's acid mantle breaks down. Here is the chain of consequences:

Short-term effects (first few days)

• Dry skin: the acid mantle is damaged, so moisture evaporates faster
• Itching: the skin is irritated and your pet starts to scratch
• Dull coat: without its protective layer, the coat loses its shine
• Flaking: the skin starts to compensate for the lost barrier

Long-term effects (weeks and months)

• Bacterial infections: without a protective barrier, bacteria easily get into the skin
• Fungal infections: a disrupted pH creates the ideal environment for fungi
• Allergic reactions: weakened skin becomes more sensitive to allergens
• Chronic dermatitis: constant inflammation of the skin
• Excess sebum production: the body tries to restore the barrier

Veterinary dermatologists confirm: up to 30% of skin problems in pets are linked to using unsuitable care products.

How pH affects different shampoo ingredients

pH doesn't just determine acidity. It also affects how well every ingredient works:

Surfactants

Surfactants are what create the lather and do the cleaning. At too alkaline a pH, they become harsher and can dry out the skin. Good-quality pet shampoos use mild cleansing agents, which clean effectively at the optimal pH without irritation.

Moisturising ingredients

Glycerin, oils and other moisturisers work best at a pH close to the skin's natural level. At the wrong pH, they can lose up to 50% of their effectiveness.

Keratin and proteins

Keratin is the main building block of the coat. It penetrates the hair structure best at pH 6.0-6.5. A pH that is too acidic or too alkaline denatures proteins, reducing their benefits to a minimum.

What pH is optimal for pets

Based on veterinary dermatology research, the optimal values are:

• For dogs: pH 6.0 – 7.0
• For cats: pH 6.0 – 6.5
• Universal optimum: pH 6.0-6.5, suitable for both dogs and cats

That's exactly why PET Love shampoos are formulated with a pH of 6.0-6.5 (the gold standard in pet skin care). This level:

• As close as possible to the natural pH of pet skin
• Doesn't destroy the acid mantle
• Lets the active ingredients work at their best: hydrolysed keratin, macadamia oil and vitamin E
• Safe for frequent use

How to check a shampoo's pH

Unfortunately, not all manufacturers put the pH on the label. Here's what you can do:

1. Check the label: responsible manufacturers state the pH
2. Contact the manufacturer: if the pH isn't stated, ask them directly
3. Use pH test strips: you can buy them from a chemist. Put a drop of shampoo on the strip
4. Trust vets: ask your own vet for a recommendation

Signs that a shampoo isn't right

Look out for these signs after a bath:

• Your pet scratches intensely for 1-2 days after the bath
• The coat has become dull or straw-like
• Dandruff or flaking skin
• Skin redness (especially on the belly and in skin folds)
• An unpleasant odour returns to the coat quickly (within 1-2 days)
• The coat feels squeaky or has become rough to the touch

If you notice even 2-3 of these signs, it's worth switching to a shampoo with the right pH.

To sum up

Shampoo pH is not a marketing gimmick but a scientifically grounded parameter, on which the health of your pet's skin and the beauty of their coat depend. Remember the main rule: pH 6.0-6.5 is optimal for dogs and cats.

Choose products with the pH clearly stated on the label and avoid human shampoos: even the most expensive human shampoo has the wrong pH for pets.