All my dogs shed too. Shedding or no shedding, bathing requirements are pretty much the same.

Chloe has short fur and pretty much only gets a bath once or twice a year. She just doesn't need one. Dirt just doesn't stick to her.

Beanie gets a bath once every month or as needed.

Talon gets a bath every couple of months or right before every dog show. This could mean two weeks in a row. I use a very mild shampoo for Talon when I bathe him so close together. I've had no ill effects. If the dog needs to be bathed more often than, let's say once a month I'd use a mild shampoo. Something that won't dry out the skin or make the coat brittle. If you don't want to bathe the dog so often I would try waterless shampoos. It looks like your dogs all have longer coats. I would comb him out at least once a week. Not brush. Comb! This gets all the way to the skin and removes dirt and things that could smell.

I hope this helps!