I also thought, 'As for men, God tests them so that they may see that they are like the animals. Man's fate is like that of the animals; the same fate awaits them both: As one dies, so dies the other. All have the same breath; man has no advantage over the animal. Everything is meaningless. All go to the same place; all come from dust, and to dust all return. Who knows if the spirit of man rises upward and if the spirit of the animal goes down into the earth?'
Solomon saw that God tests men so that we can see that, in our physical life here on the earth, we are subject to death just like the animals are. While we are alive on earth, we often have a sense of being in control but, as we get closer and closer to the end of our lives, we realize that God has numbered our days and we will die just like the animals. Do dogs go to heaven? Solomon did not have the answer.