Every dog is different, and some will tolerate food changes better and faster than others. Switching too fast can cause digestive upset and in most cases a bout of diarrhea, which, especially with a puppy that has to go out frequently even without an upset tummy, can be no fun at all.
Start increasing the amount of new food each day, and if you see signs of any digestive issues then back off a bit and give it a little more time. A few extra days of feeding Eukanuba isn't going to do your puppy any harm.
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