Patpet is a comprehensive mobile community application for pet owners, where everything about pets can be found. It provides a social medium about pets and an e-commerce platform for pet product trading. Patpet encourages users to share, post and comment, and they can also communicate with other users. Some qualified users, like professional keepers and veterinarians, will be invited to provide valuable, high-quality information. The recommendation system is trained based on users’ browsing history to recommend useful information quickly and precisely. In summary, Patpet aims to connect pet owners closely and build a better relationship between humans and their beloved pets.