If they can't hunt, simulate hunting behavior with rigorous play with toys prior to eating. (earlysvilleanimalhospital.com)
After all, the life of professional athletes typically includes intensive training regimens, rigorous playing schedules, and continuous travel (often across time zones)-- a combination of factors that makes players susceptible to insufficient sleep or poor quality shut - eye. (sleep.org)
The Vita version may look better, but apparently, put through rigorous play, the game can get stuck once in a while, whereas no such problems have yet been reported on the PSP version. (kotaku.com)