Zeuterin / Esterilsol: The New Dog Neuter, Part 2

Ark Sciences: Makers of Zeuterin

Zeuterin Part 1 Review:

Joe Tosini, CEO of Ark Sciences introduced the health benefits of non-surgical dog sterilization and cost benefits for the rescue community. Ark Sciences is the maker of Zeuterin™, as it’s now called in the US.  It’s known as Esterilsol™ globally, and has been updated for this article on 1.25.2013.

Today, I’d like to introduce you to somebody who doesn’t work for the company.

Now Meet Dr. Weedon, DVM, MPH

Dr. Weedon DVM speaks on Zeuterin™ / Esterilsol™On March 31, Dr. G. Robert Weedon, DVM, MPH, said to rescue organization representatives attending an ACES workshop at the Helen Woodward Animal Center, “I have personal experience with Esterilsol™ and I would personally like to see it used in shelters here in the United States. Why?”

The short answer is that he believes chemical castration is more healthful for dogs than surgical castration. He offers specifics on the injection procedure as compared with surgical sterilization as well as the cost and time benefit for rescue organizations. Ultimately, he stresses the importance of evidence-based decision making, outlining compelling statistics in favor of Zeuterin™ / Esterilsol™  in the face of traditional beliefs.

As I mentioned in my introductory post, Dr. Weedon is not an employee of Ark Sciences, although he does train on how to use it. His interests are rooted in dog health, animal overpopulation, and rabies control with credentials as follows:

  • Shelter Veterinarian with the Champaign County Humane Society
  • Veterinary Outreach Coordinator with the Alliance for Rabies Control
  • Board Vice-Chair for the Alliance for Contraception in Cats and Dogs

Watch to learn more …

Zeuterin™ / Esterilsol™ Presentation, Part 2

(Zeuterin™ wasn’t the name yet. This article was updated 1.25.2013)


This presentation was made by Dr. Weedon, DVM, MPH and Joe Tosini, CEO of Ark Sciences, maker of Zeuterin™ / Esterilsol™, to the Helen Woodward Animal Center ACES program on March 31st. (It will be made there again in July.)

Still To Come

  • More Q&A between Dr. Weedon and ACES attendees

This has been Part 2 of a 3 part series


  1. Wow… really interesting series of posts! I had no idea that this was out there as an option.

  2. Judith Samson says:

    What is the research behind chemical castration and the behavioural changes in dogs VS surgical castration? Will dogs chemically castrated still have a tendency to mount, spread TVT…? What about levels of aggression since testosterone levels are still present? If 20,000 dogs have been chehmically castrated in Mexico, has there been an impact study done to see how or if at all it helped the dog overpopulation problem? How long are the dogs followed after chemical castration to ensure no necrosis, one to two weeks?

    Just wondering!


    • Hi Judith, I just posted part 3 of the series. If that doesn't satisfy your questions, you are welcome to visit ArkSciences.com and ask the company directly. They are very open and happy to have a dialog with you. That's how I got all my information.

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