My dog just was diagnosed and i can't remember what it is she has...?

My golden retriever had a litter of 12 puppie a month ago. 4 days ago she was diagnosed with a bacterial infection... menotitis..? m..itis.... thats all i can remember! The infection is causing her back breast to become hard and produce sores that ooze puss. She is taking Cephalexin every 8 hours for the infection and Deramaxx for the pain. She also has a fever from the infection. Anyone know what it is?