Hundreds of stray and abandoned dogs are waiting for adoption at the San Diego Humane Society. The population problem is caused, in large part, by the cost of spaying and neutering to prevent unwanted births. "Being able to very safely and cheaply neuter most male dogs, that can make a huge difference in the number of dogs that roam the streets,” said Dr. Holly Mullin of the VCA Animal Hospital in Hotel Circle. It costs hundreds of dollars to neuter a male dog, but a new injectable solution called Zeuterin could change that. It stops sperm production forever with a...