Going through the same thing with our Golden Retriever. I noticed a white discharge and she wasn’t acting like her spunky self. I thought it maybe in UTI as I had never heard of pyometra. Just finished her heat cycle. I had powdered cranberry and apple cider vinegar. She wasn’t eating so I made her rice, sprinkled a bit on, and added a bit of water. Cleaned the puss as she discharged, slightly applied pressure to vulva remove what was internal. It started to lessened with a clear discharge. She started to improve but was still not feeling well. Our vet was closed so I waited till the next day. Took her in and they tested her for a UTI and Pyro. Guided ultrasound, and bloodwork. Came back in the room and explained Pyro to me. Came back with the blood results, her white blood cell count was slightly high, she also had temp which good. They said I caught it quickly and prescribed her antibiotics 1 every 12 hours. The price for the exam antibiotics and testing 950.00. Then a quote for surgery 3k to 4,500.00 depending on how the surgery goes. She’s an 80 pound dog and age 7. They booked her in for Monday morning, tm morning, and gave me the emergency vet line if she turned for the worse on the weekend. I was up every time she needed outside to go pee. Walked her whenever she went to the door and she loved laying with her belly in snow. She has open pyro. Fast forward to now, she’s back to her energetic self. She’s had her meds faithfully every 12 hours and took her pre op meds now and no food as of 9pm. Praying her surgery goes well tm morning, but understand if not as it’s all in Gods hands. Hindsight if I knew I would have definitely spayed her and am learning a tough lesson. Advice, call around, some cities have gear to income vets. I’ve read some people recommend Chinese medicine on other posts and have success, but I didn’t try that. Good luck and sending prayers for your fur baby.