This is, largely, what retirement has looked like for former New York Yankees shortstop Derek Jeter: Derek Jeter never owned a dog and has been afraid of them his whole life. He now owns a 100 pound Mastiff pic.twitter.com/QjsY5KxLDH — SportsBlogNewYork (@SportBlogNYC) November 3, 2015 After ending his 20-year baseball career last year, Jeter has taken on what he calls another job — caring for his 100-pound Mastiff named Kane.