
Yes but did they breed from them succesfully after.
I had my first bitch escape out the front door at her first season so needed the morning after jab. I then had her on delvesteron for a couple of years, and then decided to get her spayed.
The vet out of interest examined her womb and ovaries and found the ovaries were cystic and the womb rather fluid filled for her likeing.
With bitches hormones being so delicate to balance, and womb infection a frequent enough occurence in bitches not messed about with, it just isn't worth the risk of messing up her reproductive system if she is to be bred from.
If she isn't to be bred from she can be spayed. I would sooner risk the side effects of spaying than those of chemical control.