In Haiku it seems that nature and animals like frogs make the speaker happy. It brings to mind the setting of the pond being silent and calm. Then the frog jumps into the pond breaking the silence with the splash of water. But then the silence and calm returns to the pond.
In concrete cat it seems that the speaker loves cats and that is what makes him happy. He describes all of the features of the cat even the items like its litter box, food bowl and the mouse it plays with. It shows how much the cat makes him happy.
