Feeding your animals costs 1 energy, but the amount of Love they gain depends on your accessory level. The Love Meter ranges from 0-100. A hungry animal will not produce rewards, so you will need to feed your animals at least once. Anytime the Love Meter is above 0, you can claim the rewards. However, a higher Love value will produce better rewards, so ideally you will want to get your pets’ Love Meter as high as possible (well you’d want to do that anyway, right?). Once the rewards are claimed, the Love Meter is drained to zero and your pets lose 1 health point.