Stump pyometera’s are not nearly as life threatening than a full blown infection in the uterus. They are also significantly less common as most vets do a good job removing the entire chain.
As someone who works in emergency and referral practice, I can tell you I see a LOT more intact females with pyometeras and mammary cancer than spayed females with bone cancer.
Spaying is a choice, its neither right or wrong not to spay. But YOU chose not to spay, and now you are dealing with the consequences.
Please dont put your dog down because you chose not to spay. I am also in Ontario and can give you a huge list of rescue organizations that will take her and give her the care she needs.
Chances of your dog developing bone cancer 0.00079% - 1.2%
Chances of your dog developing pyometera 23% - 33%
Intact bitches have a seven times greater risk of developing mammary neoplasia than do those that are spayed.
There are certainly benefits to having an intact female (spay incontinence, the desire to breed if needed, decreasing chance of bone canter - only proven in rottweiller so far). But, there are also benefits to spaying. Again, not saying there is a right or wrong decision.
Not all pyometera’s are surgical, some that are caught early can
treated by antibotic thearpy. For your dog, I really hope this is the case.
Stump pyometera’s are frequently found when part of the hormonal
chain has remained (ie. the uterine stump, ovary). If everything
is removed, there is no stump to become infected.
It is generally the hormones from intact females, that cause
inflammation and later infection. With spays where one ovary is left
chanes are significnatly diminished, yet there is still some hormonal
influence. Often this type of surgery is a reasonable compromise and is becoming a more common option that allows hormones to function, but also
preventing unwanted pregnancy.