At the end of mark twain's narrative i sell a dog. why does the narrator say he was always honest

It is because in the whole part of the narrative the dog was very consistent in doing the right thing and helping others such as the baby. After all his loyalty to the family, he was still accused and is hated by the people. And then the truth came and he received praises from different people.

I went to the beach last Friday, the sand was warm on my feet. I could hear the waves crashing against the shore, kids were running around playing volley ball.