Why is my miniature schnauzer so smelly?!

okay, my dog is 8 years old now, he's been nuetered, and we bathe him regularly. He gets his haircuts regularly as well. And I know this is absolutely disgusting but, he's leaks out this liquid poop that smells absolutely horrible. But that's not why he stinks. When we pet him, his odor is on our hands. . It's horrible! HELP! What's wrong with my dog?!
Why is my miniature schnauzer so smelly?!
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