From Zelda Legends Wiki
In Hyrule Town, you'll meet Stockwell, the shop owner. After a certain point in the game, you'll see a bottle of some brown substance standing on the counter. After being asked about it, he'll say it's dog food for his dog, bFifi. If you deliver it to her, he'll give you the bottle. Fifi,in Stockwell's house at Lake hylia, will talk to you if you go minish-sized and press A while facing her. What she basically says is that her master doesn't have any any time for her and that she's lonely.She is cute, small and white, with a pink bow tie on her head. She looks a bit like a terrier.