Drug Could Someday Replace Spaying for Dogs Arizona scientist working on alternative Chemspay By Sarah Whitmire, Newser Staff Posted Jul 23, 2011 1:34 PM CDT 3 comments Comments An Arizona scientist is working on an alternative to surgical spaying. (Shutterstock) (Newser) – An Arizona scientist hopes to make the surgical spaying of dogs a thing of the past. The Arizona Republic takes note of the drug Chemspay, which shows promise as a cheaper (and less painful way) of sterilizing female dogs. It evolved out of menopause studies on mice by Dr. Loretta Mayer, who successfully tested it on strays on a Navajo reservation at the request of its animal shelter's director. “He said to me, ‘If you could do for a dog what you do for a mouse, I wouldn’t have to kill 400 animals a month,’” Mayer said. She hopes to begin FDA trials next, but approval would still be years away.