You can change foods using bland diet. Give bland diet a couple of days then one day of half kibble half bland, then full kibble the next. Switching this way actually causes less of an upset tummy.
I am concerned. Maybe the bag of food is stale? You said it smelled bad right? I have gotten a bad bag of food before. I knew it immediately. Smelled funky! And my bullies never turned their nose up at anything before, but they would not eat it. I took it back to the store - they gave me a full refund.
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