Abstract: A doghouse with multi-channel flow-through fresh air ventilation comprising a generally arcuate-shaped hollow top part which has a rectangular circumferential bottom rim configured with four sharp corners, and a generally box-shaped hollow bottom part which has an octagonal circumferential top rim configured with four cut corners. When the top part is detachably attached onto said bottom part by interlocking members to construct a doghouse, the rectangular circumferential bottom rim of the top part is adjacent to the octagonal circumferential top rim of the bottom part, and the four sharp corners of the rectangular circumferential bottom rim of the top part are located above the four cut corners of the octagonal circumferential top rim of the bottom part respectively to form four shielded and heightened openings facing downwardly, to thereby provide multi-channel flow-through fresh air ventilation for the doghouse.