But the Schlitters can't keep him.
"Our first instinct was, 'We have to keep him,' but then reality sets in," Schlitter said. "We already have a dog."
The animal they found is a Chihuahua and terrier mix, between 2 to 3 years old. Schlitter called his Cubs teammates, but no one could take dog, so he brought it to Maricopa County Animal Care and Control at 2630 W. Rio Salado Parkway, which is next to the Cubs' complex.
"It's a pretty sad sight there, and we didn't want to leave him, but we didn't have any choice," Schlitter said. "There are a million dogs dropped off at these control centers, and a lot of them are euthanized."
The dog has a great temperament and got along well with the Schlitters' pet.
"As soon as we brought him home, he was playing with my dog," Schlitter said. "We were like, 'We've got to keep him.' But I said [to my wife], 'I have no problem keeping him, but you'll be the one most of the time having to watch him.'"
Anyone interested in adopting the dog should contact the Maricopa County Animal Care and Control Center.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.