Here's why:
* Dogs are not fertile past their reproductive years. The average lifespan of a dog varies by breed, but 17 years is well beyond the typical reproductive years for most dog breeds.
* Older dogs often experience health problems. A 17-year-old dog is likely to have health issues that make pregnancy dangerous and potentially fatal.
It's important to prioritize the health and well-being of your senior dog, and responsible pet ownership includes spaying or neutering to prevent unwanted pregnancies.