Thank you for replying to my question.
The mammory lumps are benign. I just thought I would ask on here as my dog is extremely frightened of people and a nightmare to take to vets. I have worked hard with her to socialise by going to training classes and having trainer come to home. She is much better than when I rescued her but will never trust people. I have a very good understanding vets so will now contact them. Thank you once again.
I would definitely have the vet check her. This discharge could be either "Stump Pyometra" (where the tissue left behind after the spaying surgery gets infected. This is not very common, but definitely can happen. Antibiotics would be needed)
-Or...she has a bladder problem. To produce blood-stained (or brownish) discharge, there could be bladder stones possibly, or something causing irritation in her bladder.
Breast lumps are common in older females. Many of them are benign. My dog has four. BUT -always get the lumps thoroughly checked by a vet, and needle-biopsied is the best solution, so you know for SURE what you are dealing with. Some lumps have to be needle-biopsied in more than one place in the same lump.
This procedure is quick, does not need anesthetic, but understandably, can be a bit uncomfortable for the dog, so it would be a good idea if you have someone with you she trusts (like a family member or good friend) -to help hold her still during the procedure. Some breast lumps, even when benign, can cause some oozing in the nipple, of a slightly brownish substance. But this can be a suspicious sign as well, so always get it checked out.
The discharge doesn't necessarily sound as if it has any connection with the breast lumps to me, but only a vet would know for sure.