The literal translation is "Work is not a wolf. It will not run away." Imagine that you captured a wolf in the wilderness and wanted to keep it as a pet. No matter how hard you try, it's still a wild animal and it will use every opportunity to run away. Russians have lots of sayings and fairy tales that teach you that you shouldn't work hard. This saying urges you to postpone your work because it will not run away like a wolf. It will stay there and wait for you.