Has anyone had this happen with their dogs?

Today I switched my dogs food, from Royal Canin to Canidae All Stages. My dogs loved Royal Canin, but I wanted something better. I mixed the Royal Canin and the Canidae to wean them of the Royal Canin, and when I put it down for them, they picked out the Royal Canin and only ate the Canidae. I was just wondering if anyone had this experience with their dogs.