hukun-da-wo sute-te mizu-no soko-he atama-wo ire-te-mire-ba, ...
hold.in.the.mouth-PERF-ACC throw.away-TE water-GEN bottom-to head-ACC put.in-TE-see-BA
(the dog) threw away what (it) held in its mouth, and put-and-see (=gave a try to putting) its head into the bottom of the water, and ...