Zeuterin, an injection of zinc gluconate and arginine, could soon offer U.S. veterinarians a new way to sterilize dogs. One of a number of nonsurgical options gaining interest, Zeuterin is injected directly into the testicles, and trials indicate it is effective in 99.6% of dogs. It could be commercially available by the end of the month. "This product isn't a product," said Joe Tosini, CEO of Ark Sciences, which owns the rights to Zeuterin. "It's really a procedure that has to be taught." Veterinarians who use the approach will need to complete a five-hour course.

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