I’m in the same boat, this past month our 1 yr old terrier has become super picky and will graze her food throughout the day now instead of eating it all at once. I’m not sure if it is an age thing or about the same time I started trying Merrick which she has turned up her nose too. Now going back to Science Diet she will eat it but super slow and will run around the house with a bites in her mouth. I think Im going to try a different brand like Fromm or Acana but it has been a frustrating experience trying to switch to healthier foods
