How Often Do You Bathe Your Dog?

We bathe our dogs twice a month. Often times, just once. Chooey and Buchi gets bathed twice a month because they have very thick fur and brushing can't fully eliminate the dirt that sticks to it. Also, we have to wait for warm weather because the owner of the house only allows bathing outside, where the hose is.

Our dogs are on multivitamin with calcium and omega 3 supplement. I'm not sure if it helps lessen the dryness of their skin.