With Bob and Dot constantly busy, they have no time for Enzo. Bob thinks it's time he gets a friend, but that is easier said than done.
Why I say this is because this is the first episode in which part of Dot's past is revealed (which is revealed more extensively, later, in Season 4). Learning all of this enable viewers to possibly sympathize, or relate to the circumstances of Dot. They can also relate to Enzo who is, obviously, distraught over the death of his father and the fact that Bob and Dot are his only friends (who aren't even his age).
Nevertheless, the beginning of the episode, in my opinion, is the best part and it'll have viewers possibly giving weight to some tears.