My beagle/boxer mix female has just started on a new food for having allergies. She has been on it for a little over a week. Her excrement is very hard feeling when I go to clean it up and is kind of green in color. She also seems to have a case of gas when she is passing her excrement. She acts normal like her usual goofy and playful self. Has anyone ever experienced this with any of their dogs before? If it persists, then I think a vet visit is in order.