I LOVE Dobes. I grew up with 2 Dobes and a Rottie. I love the blacks, but a nice red is really eye-catching too. I would love another one day and I think I'd just take whatever color pup the breeder recommended. Or maybe one of each...
What color is she? In the close up photos she looks blue, but in your signature pictures she looks red. The blues and fawns can suffer from skin conditions so, if she is blue, perhaps it has to do with that rather than her food. If she's red, then I would probably look at food as my prime suspect. Despite her color, it may just be her food, but I thought I'd throw the color related skin issues out there too. There's nothing more frustrating than having a dog exhibit some kind of reaction to something leaving you with a mystery to solve. Been there, done that, got the t-shirt.
If it does turn out to be chicken, rest assured that there are lots of other options besides chicken as a bone source. I have a dog who had not had more than a bite or two of chicken in all of the 2.5 years I've had him once we discovered that chicken was the reason for his constant diarrhea.
His bone typically comes from turkey necks, whole cornish game hens, ducks, even a goose once. Just about any other bird I can find. Rabbit is also a good option although it is more expensive than poultry.
At 6 months, she may still struggle with larger bones like pork, goat, sheep, etc. but those will become options as well. My Bluetick's main source of bone is pork ribs and turkey necks. With a coated dog that has full dentition, you won't have to worry about your girl getting frustrated with ribs like my Xolo boy does so her options for bone WILL expand as she gets larger and stronger.