It's so gross and I cannot get it to stop.

I have a 1 year old neutered dachshund. Puppy pad trained. He will not ever go potty outside. I take him first thing in am...alone or with the other dogs. We walk and wait then walk and wait. 30 min. Go inside and he goes right to his puppy pad and pees on one and poops on the other. I've tried patting his tummy area outside. Praising hugely the other dogs (females) when they pee and he smells where they pee. Fortunately I can afford puppy pads but I'd love to have him per outside. I've asked my husband to go per on a Bush and show him but he won't . Parker was a rescue that we got at 8-10 weeks old. I regret even using a puppy pad. Parker goes out every time the girls go out. Any thoughts?

Does anyone have advice for how to manage walking a large group of dogs? I'm interested in becoming a dog walker but one of the main challenges I foresee is dealing with all the smelly poop. Any tips appreciated!