There is an increased risk
of pyrometra in intact female dogs.
My dog had
pyrometra surgery about 3 days ago she is eating and going to the bathroom normal but she has been shaking and panting really bad.
It also
eliminates pyrometra, a very severe infection of the uterus that if not treated in a timely manner leads to death.
Unspayed female cats and dogs have a far greater chance of
developing pyrometra (a fatal uterine infection), uterine cancer, and other cancers of the reproductive system.
If your cat is bleeding it could be because of an infection, for
example pyrometra, which is a deadly infection of the uterus and should be treated by a veterinarian at the earliest.
Older dogs who are left intact are at a greater risk
of pyrometra and the only way to treat it is by emergency spay.