Do we blame Texas Rangers left-handed pitcher Derek Holland’s injury on some sort of Chicago Cubs curse? It was Holland’s dog, Wrigley, a boxer, who caused the starter to buckle on the stairs of his home and injure his left knee bad enough that he needed arthroscopic surgery on Friday morning to repair torn cartilage. “He was running up the stairs and clipped me,” Holland said Saturday afternoon. “I hit my knee on the step, and if it wasn’t for me grabbing the rail, I might have fallen all the way down the stairs and cracked my head open.” Holland was adamant that playing hockey, something he does at times during the offseason, had nothing to do with the injury. He said he played on Monday night, but was fine Tuesday before the accident happened. “I’m getting tired of the assumption that I hurt myself playing hockey,” Holland said. “I played the full game and was fine.” Holland said it was a recreational league and that hitting is not allowed.