Frequest baths for a dirty puppy

Hey guys so my husband and I adopted our second dog recently and he is a 4 month old shepherd mix. He has a neurologic condition and has a hard time standing and walking so every time he goes outside he gets super dirty. We have gentle puppy wipes that we use after every outing but he gets pretty dirty much faster than we’re used to. We would like to bathe him around once a week but I’m worried about drying his skin out and irritating it. Is that way too often even with the circumstances? If not, are there any recommendations for moisturizing shampoos/conditioners that would make it safer for frequent washing? We just have a standard oatmeal puppy shampoo at the moment. Any advice is appreciated 🙏🏻