Dog was very helpful in the poem.
he helped those member's in packing their stuff and bags .
on the boat while the three men were travelling they decided to prepare for dinner in night dog also help them in doing it by bringing a dead rat which he seems to be a potato .
while the men were packing the bags dog killed the three lemons by chasing them .
at the time we found that he was not going to live more but he proved his ability by surviving .
from all the above reasons we can say that dog was helpful and brave.