He's not pooping because he's not eating.
Has he been to the vet? A lot of pups come with coccidia and other parasites and those can be quite painful. Otherwise he could still be just settling in so he's not feeling like eating yet.
One thing you could try (to see if it's because he just doesn't like the kibble) is to make a gravy with the wet food by adding some water to it and mixing it in with the kibble.
Why doesn't he get treats?
Ruth & the 4 Legged Rescue Gang
Rafi the malaroo
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Gio & Varda, the krazy kittens
....In my heart: