On a typical morning, starting at 7 a.m., Montoya picks up 20 dogs, KOIN reported.
"I've never had an issue with a pitbull. I've never had an issue with a German shepherd or a Rottweiler," Montoya told the Oregonian. "But, let me tell you, I've had an issue with a Chihuahua."
Montoya said he came up with the idea for the Doggie School bus because he loves dogs.
"I'm looking always for the best for them," he told KOIN.