Some dogs are gross like that-LOL! Maggie (beagle) tries to do that all the time. I really have to watch her. Luckily my basset doesn't enjoy those kind of treats. Yuck! I don't know if it's worse to eat poop or roll in poop. Maggie is an equal opportunist.
Dogs are just gross. She's a perfectly normal gross dog! lol Mine doesn't eat DOG poop,though I wouldn't put it past him, but he will happily chow on cat poop, rotten trash, or road kill given the smallest opportunity.
"Be who you are and say what you feel. Because those that matter, don't mind...And those that mind....don't matter."
It may be normal, but it could get your dog sick. There are a number of parasites your dog can pick up from another dog's stool. Discourage the behaviour. I hope you have some doggy toothpaste around! Super Yuk!