Personally, this is why I don't lke to switch puppies off of the food they came eating for several months. I feel like the stress of adjusting to a new enivornment, the stress on the body with the vaccines, coupled with the stress caused by a change in diet can be too much for some pups.
In this situation, I will generally just tough it out. Put the food down for 15 minutes and take it up, 3x a day. I would try this for a week or so and monitor your pups weight and activity level. If he's in reasonable body condition and he's still perfectly active, I wouldn't really worry.
A Healthy Puppy will not starve itself, but it may try to hold out for something it likes better for a little while. They also go through eating/growth spurts. Some days they look like they're wasting away, and the next they look like little butterballs, some days they eat and some days they don't.
Bianka vom Eisernen Loewen IPO3, CGC, TC 1-3-08
Cade vom Eisernen Loewen IPO1, CGC 3-25-09
D'Artagnan (Tag) vom Eisernen Loewen BH 2-2-10
G Aiko von Burkndeiros SchH 3, IPO3, FH, TC, KKL2 9-17-02 (Retired)
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