The thing about hedgies though is that there is no way the pig could hurt it, and a hedgie would rather roll up in a ball and hide than attack. Remember, they are both prey animals, neither have much of an aggression drive other than with their own species. Yes, the pig could get injured by a spike, but she'd learn to keep her distance. Remember, people keep dogs and cats happily together, people also keep guinea pigs and rabbits (though it can be dangerous for the pig to get stomped on) Cats live with birds. Having them different species actually makes it easier for them to co exist. but, even though they can potentially coexist, any play time should be kept short, and closely monitored.