This is why you need to spay your dog. This excellent article contains the most amazing pyometra surgery video I have ever seen. The excellent veterinarians at San Jose Animal Care and Control amazingly were able to save this dogs life, but in reality, many other dogs are not so lucky. The photo below shows a 15lb uterus filled with pus. The dog was skeletal, totally emaciated and weighed only 40lbs after the surgery. This surgery, and medical care costs thousands of dollars, and the dog could still die. The most affordable and humane option is to spay before this happens! This photo is from www.tailsofasheltervet.com.