In some countries a drug called Alizin (aglepristone) is available by veterinary prescription to effectively terminate early pregnancy in dogs when administered within the first 45 days after mating. Alizin can be effective in safely ending a canine pregnancy under professional supervision, writes Mary Cope, PhD.
Cope continues to explain options U.S. veterinarians have for ending pregnancy in dogs. Ultimately, the article ends with a discussion of spaying dogs to reduce the risks of unwanted pregnancies and conditions associated with pyometra.
Source: Whole Dog Journal, May 12, 2025. Link.