Profit: None, doesn't make any produce.
Care: Make sure to bring your Dog in on Rainy/Snowy Days, but leave him out on Sunny or Clear Nights. Ellen will bring you your Dog named Koro on the second day in the morning. You are given the choice to rename the dog. The dog is used to scare the moles that pop out of the ground and to keep stray dogs from ruining your fence during the night.