A cat wears a “Tsunagaru Col” gadget next to a smart phone displaying the connected app, at the Anicall Corp booth during the Wearable Device Technology Expo in Tokyo January 14, 2015. The gadget (“Tsunagaru” means connection) for animals tracks information about pets, such as the location and other animals the pet might be interacting with, with the purpose of providing “social networking” for animals. The expo runs until January 16 as a part of Japan's largest electronic exhibition expected to attract around 77,000 visitors, according to organisers. (Photo by Yuya Shino/Reuters)

A cat wears a “Tsunagaru Col” gadget next to a smart phone displaying the connected app, at the Anicall Corp booth during the Wearable Device Technology Expo in Tokyo January 14, 2015. (Photo by Yuya Shino/Reuters)

A cat sits with a wearable terminal enabling communication via an app on mobile terminal at the Anicall Corporation booth during the Wearable Device Technology Expo in Tokyo, Japan, 14 January 2015. The device collects informations about the animal such as its location to interact with other pets and create a so-called “social network” for animals. (Photo by Franck Robichon/EPA)

A dog sits with a wearable terminal enabling communication via an app on mobile terminal at the Anicall Corporation booth during the Wearable Device Technology Expo in Tokyo, Japan, 14 January 2015. (Photo by Franck Robichon/EPA)

A cat with a wearable terminal enabling communication via an app on mobile terminal plays with a toy at the Anicall Corporation booth during the Wearable Device Technology Expo in Tokyo, Japan, 14 January 2015. (Photo by Franck Robichon/EPA)