The pet or mount will then disappear from your inventory. Don't panic, those simply become spells that you will be able to access through your Character panel. There's a tab there labeled 'Pets', which will contain two sub-tabs called 'Companions' and 'Mounts'. Selected pets and mounts will be previewed in the window, and you can easily drag your pet and mount spells to your hotbars. Pets are instant cast spells that can be cast while moving and activate the GCD. You can create macros and key bindings for pets and mounts just as you would any other spell.