My lot came home yeasterday day after their walk looking like this
Delta looked like this about 3 or 4pm
and this was her about 8 or 9pm no bath at all
if they are muddy like in the photos they go in the crate with a towel for like an hour them they come our mostly dry and almost clean then you just brush the dirt out.
i have always found sand quite easy to brush out.
you would think that water would hydrate the skin but the combination of the shampoo and water drys out the skin because it takes out all the natural oils from the skin and coat. i work at a kennel so i wash my hands all the time and i can tell if i have washed them to much as my skin starts to crack, this is in both summer and winter. i would ask your groomer, but i wouldn't want to bath my lot that much. just make sure its a sensitive shampoo you use, or one for dry skin just in case. and maybe as some cod liver oil into his diet to help get oils back into his skin and coat.
for me dirt is all part of owning a dog. it drys in brushes out and you vacuum it up job done. we have covers on the couch for the dogs to lie on.
i know a dog who was washed every day because the owner had OCD about cleaning and she some times bathed him twice a day and his kin was in a terable condidtion and his fur had fallen out in patches. i know thats exstreem he looks lovely know with his new owner and the hair all came back.