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The Mounts and Pets window was added with Patch 5.0.5 and has a button on the Micro Menu. This UI may have been in Patch 5.0.4, but the Pet Battle System portion of the Pet Journal was not enabled until the next patch release.
Pet Journal tab
- Patch 5.0.5 (11 September 2012): Pet Battle System functionality enabled.
- Patch 5.0.4 (28 August 2012): Added.
- β Patch 5.0.1 (Beta): Partially added.