Last night Penny the Staffie got real nasty and started growling at Buddy and ended up biting his ear. It wasn't until about a half an hour later that I saw she actually drew blood. I didn't see any behavior in either of them that could have triggered this. Last night they slept for a while on the same bed and today everything is just fine. I've cut back on Penny's food and was wondering if this is making her a little cranky. Or maybe this is just a dominance thing. We've had her for a year now and she can be a bit bossy with the boys; however there have never been any major issues. Has anyone been through this?