To avoid tummy upset when switching foods, you need to slowly transition her from old to new over the course of a few weeks. We tell clients week 1: 3/4 old, 1/4 new. Week 2: 1/2 old, 1/2 new. Week 3: 1/4 old, 3/4 new. Week 4: all new!
Personally, I've switched my dogs over "cold turkey" before with little to no problems (sometimes you run out of food or emergencies happen!!!). It depends on the dog... it isn't HARMFUL to them if you don't transition them slowly, but you will avoid diarrhea (unless their system is VERY sensitive). Since you're giving her "people food" with no problems, I would assume she doesn't have such a sensitive tummy.
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