Some stores like Pet Supplies, Petco and PetSmart have sample bags of kibble that you can try. Like Lovetodream88 suggested, if Max will not eat crunchy food try adding a small bit of warm water to soften the kibble, drain off the excess water and see if Max will eat it. Feed him twice a day, once in the morning and once at night. For example say recommended daily amount to feed is 1/2 a cup a day, split that in half, feed 1/4 cup in the morning and 1/4 cup in the evening, say 7 or 8AM and 5 or 6 PM.
If you are feeding him Blue Buffalo I would change that, Blue Buffalo has had many recalls on their food, I don't trust that company.
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