Just give food without showing affection, [animals] might not get sort of 100% satisfaction. So they also, you see, when we human beings, we show affection, the poor animal also respond to us.
Material objects give rise to physical happiness, while spiritual development gives rise to mental happiness. Since we experience both physical and mental happiness, we need both material and spiritual development. This is why, for our own good and that of society we need to balance material progress with inner development.