Puppy pooping at night?

My 14 week old golden retriever puppy has recently started pooping only at night. He will bark & let us know so we have time to take him out, but he never poops during the day anymore. Is this normal? The poop is sometimes solid / sometimes soft. He is acting completely normal otherwise. We feed him dinner at 5:30 & put up his water by 7:30. The last few days we have been feeding him chicken / rice & no change.

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Hey! Did you ever figure out what the problem was? My golden is almost 16 weeks and for the past few days he has only been pooping at night (and it is diarrhea). Doesn’t poop at all during the day