In the first box of meals that we send to your dog, we'll include some info about getting them used to a freshly prepared, gently cooked diet. They may need a few days (or sometimes a bit longer) to adjust to the new ingredients, flavours and textures - there's lots that goes on in the stomach when a dog's regular diet is changed. It's likely they'll want to dive right into a whole bowl of Butternut, but taking things slowly to start with massively reduces the risk of any stomach upsets.
In a nutshell, we'd suggest feeding your dog a very small amount of Butternut initially, mixed in with what they're currently eating. You can gradually increase the amount of Butternut they're eating each day, and if your dog has any runny poops then it's often a sign that they need to take things a little slower. Some dogs can take a week or more to move over to Butternut completely, so it's totally fine to go at your own pace here, swapping out their old food as you go until they're on their full plan.