Yvonne (Almost Perfect)

Yvonne was Torchwood Three's cat from early 2000 to 2006 or 2007, a few weeks after Ianto Jones joined the team.

Biography
Yvonne was extremely close to Jack Harkness, who was very upset at her "death". He ordered Ianto to check Myfanwy's stool samples for three months to see if she had eaten her. The cat ended up at a restaurant in Cardiff who took her in. (PROSE: Almost Perfect)