I would advise taking her to the vet. Then you can get a better idea of what is wrong. They can dehydrate so quickly. Please let us know how she is doing.
she is 35lb i am feeding her with 3 cups a day.i can see his 2 last ribs a little.How is Roxy's weight? Is she a little chubby, or can you feel her ribs easily? This issue has been ongoing pretty much since you got her, and I am wondering if you are feeding a little bit too much.
My puppy was on origen and it was hard to digest then i switched her to acana puppy large breed and she was doing good. She got maybe something not serious because today her poo is less liquid more solid but still diarrhy.I would suggest you put this puppy on Purina Pro Plan. She has had digestive upsets for several months and dobermans seem to do very well on Pro Plan. A lot of doberman breeders feed it. In the meantime, I would take her to the vet.
Giardia often presents as off and on diarrhea. They will be fine one day, and then have diarrhea the next. If you have not brought a stool sample to your vet, please do. Your girl seems to have had tummy troubles off and on for a while; she really needs a vet visit.to give news she is doing realy better today with good poo. it was probably only a virus.