you have such wonderful piggies!
But I would not use Johnson shampoo although very long ago I used that product for my piggie and also for my little daughters. Actually its components are not at all good and now it is not even recommended by paediatrician doctors.
I have three piggies, two longhaired and one shorthaired. The one with short hair does not need any bath and I only wash his but and his feet once in a while. He often walks on the poo...
The sows with a long hair absolutely need a bath once a month (or two months), especially one of them. The water comes out totally dark brown and their hair of the belly becomes easily dirty and stuck with the wee.
I use a normal shampoo for newborns, it is not a famous and expensive brand; actually it is very cheap, but I have checked all its ingredients online and they result absolutely safe (there are no parabens, no PEG too; parabens have an effect on the hormonal balance). It is the same product we all use at home.
There is no rule for deciding how often a pet (and a child) needs a bath: of course he needs to be washed if and when he is dirty and smelly... bacteria of the wee and the poo in contact with the fur and the skin can cause irritation and infection, as it also happens to our skin who needs a careful hygiene. But if you wash your piggie and the water comes out clean, that has been a wrong bath...
Moreover, the wee in contact with the long fur make it become arid and "burnt" and then you would need a scissor. A good hygiene with a good natural product let the fur bright, healthy, soft and without any knots (I never brush my piggies because they hate the brush)
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Use your good sense, have a careful glance at the shelters of supermarkets or visit a shop for natural products and you will not be wrong
This below is the INCI (ingredients) of the famous Johnson Baby Shampoo. In yellow there are suspicious substances, in red toxic substances...
johnson.pdf
This below is the INCI of the cheap product I am using:
gently.pdf
I hope the PDF files work...