Smelly and blacken nipples from female dog

Blacken nipples with a bad smell, when squeezed the black tip come off the nipple with what looks like dried oatmeal.

[seeana]

More background please.No way enough info.

[ginger899]

It sounds like the nipples are oozing a black/brownish substance and this is drying to form a crust.
This needs to be seen by a vet. Mastitis can cause this. Likewise breast cysts can cause the nipples to ooze (even benign ones) Certainly suspicious (possibly malignant)breast lumps can cause this.
If your dog has what is called "False Pregnancy" the changing, and out of balance hormone levels can cause oozing nipples. Also of course pregnancy, especially if an infection has got into the breasts.
Get her to a vet to have this checked out.