Not all dogs immediately take to new food with enthusiasm. Food refusal is a common problem that can have various causes. Some dogs are simply skeptical of changes, while others react to the smell or texture of the new food.
In such cases, it can be helpful to gently warm the food to enhance the flavors. Smaller, more frequent meals can also increase acceptance. Mix the new food particularly thoroughly with the usual food so that your dog cannot selectively pick out the old food.
Mild digestive issues, such as softer stools, are normal during the first few days of the transition and indicate that the gut flora is adapting. As long as these symptoms remain mild and subside after a few days, there is no cause for concern.
Warning signs include persistent vomiting, bloody diarrhea, or complete refusal to eat for more than 24 hours. In these cases, you should stop the food change and seek veterinary advice.