The Sony AIBO is a series of robotic dogs and pets. The firm announced a prototype in mid-1998 and the first consumer model was introduced on 11 May 1999. New models were released every year until 2006. Other inspirations included lion-cubs and space explorer, but only the ERS-7 and ERS-1000 versions was explicitly a "robotic dog".
On 26 January 2006 Sony announced that it would discontinue AIBO and several other products in an effort to make the company more profitable. Customer support was withdrawn gradually, with support for the final ERS-7M3 ending in March 2013.
In July 2014, Sony stopped providing repairs and did not provide customer support or repair for AIBO robots.
In November 2017, the firm announced a new generation of AIBO after 11 years. The fourth generation model, ERS-1000, was launched in Japan on 11 January 2018. The second lottery sale was set on 6 February 2018.
Several prototypes have been displayed by Sony. Early models were insect-like with six legs. The specifications and design of the 1998 prototype, described in a Sony press release, closely match those of the first generation AIBOs. Differences include the use of PC-Cards for memory (rather than MemoryStick media), the use of two batteries, and the option to use a 2-wheeled "rolling module" in place of legs.
Find more info and all models on Wikipedia.