Erm, I don't think a healthy dog would eat it's own excrement. I don't know of any of my friend's dogs eating their own but in a wolf kill the most sort after treat is the stomach contents of the herbivore that has just been brought down as the part digested plants provide much needed minerals, hence dogs will eat horse excrement as it's recycled grass and easier to digest than raw grass.
Dog excrement though is a whole different kettle of fish. Here's a site I found that may help to explain why your dogs are fond of their own brand:

Stopping Dogs From Eating Poop

assuming Oscar is a young dog? they do grow out of it! well mine did anyway
regards
Sue

Try giving Oscar a Pineapple chunk daily, it has worked for other people's dogs

I'm going to try the pineapple. Thank you! I've only caught him doing it once. I check very carefully for poo. Ah the things we do (out of love, of course!) for our dogs.

Hi,
My Grandmas beagle eats hers and other dogs poo. My mum looks after her when my grandma goes out on a saturday or sunday and I was over there, we were nattering in the dining room and noticed in horror she was eating what one of my mums border collies was doing as it was being produced!!
She does have a ravenous appetite and is on a diet so I thought it may be down to lacking something in her diet. Interesting about the pro biotic as i always keep some powder in the cuboard for my dogs may get my grandma to try it. Oh yes even though you clear up all the time it's when you go on walks thats a bit more difficult!

To be honest i wouldnt worry about a very young pup eating its poo because as a puppy they try to eat everything and anything anyway, they are like baby humans learning!!
mine started eating his poo if i wasnt quick enough to pick it up (hes 9 1/2 wks old) but now when hes done a poo he looks at me then i pick it up!
but god, id not let his tounge near me!!! haha!
if it was happening to an older dog id want to stop it asap, i dont think its the hardest bad habit to stop!

:-)

Harvey my Shih Tzu eats his own poo. I`m hoping he grows out of it.