
Some people use normal chalk ( Calcium Carbonate) that you can buy at the chemist, corn flower or baby talc.
The real use of chalk or cleaning powder is just that for cleaning.
I bath and chalk my dogs up a week before a show then brush the chalk back out.
Why do you want it to stay in the coat is it for showing? there are various things that can hold chalk in but best to know why you want to keep it in the coat.
Chalk can also cause irritation to some dogs so that is worth baring in mind.