IGN are one of the first who reviewed GoPets Vacation Island which was released for Nintendo DS. Looks like they not very impressed. Here are some highlights:
GoPets: Vacation Island takes the same principle of the website, and shrinks it down. Players can create their own pet, and customize it with over 700 pieces of clothing [...]

Popularity: 4% [?]

GoPets is a virtual world that involves raising a cutomised 3d pet, downloaded onto a player’s computer. The world was lauched on August 4, 2005 and constantly stays in development and growing. What they says about themselves:
GoPets is a community that is made up of both real people and virtual 3D pets that live [...]

Popularity: 7% [?]