My corgi had lumpy mammary glands and after having the lung x-ray and a biopsy, she was found to have cancer in one teat, but the vet removed all the other fibrous lumps and she ended up minus 5 teats, Fortunately it hadnt spread to the lungs and she is absolutely fine, like a button. Im so glad I took her as she is eleven and now hopefully she will have some more happy years. I really hope that your dog is ok and will think about you, its nervewracking waiting to hear from the vets and iI empathise with you. good luck