- Not available on that edition (the reason is in the tooltip)
- Depends on the setting, your class or another addon (details in the tooltip)
What it does
Checks how many seconds are left on the cooldown of the pet spell you choose, compared with the number of seconds you set. A pet spell your pet does not know never matches.
Why you might use it
Compare the remaining cooldown on a pet ability, in seconds. Use it to plan around a pet's longer cooldowns, for example saving your own interrupt when a Felhunter's Spell Lock will be ready within 2 seconds, or holding Frost Nova while a Water Elemental's Freeze is about to come back. On Retail and Forever, cooldowns can be hidden during combat, encounters and other restricted content, and then the condition is unavailable. See also Pet Spell Available and Spell Cooldown.
Example
the cooldown on Spell Lock is less than 2 seconds
Settings
What each setting in the condition editor means, from the game's own help.
The icon next to the spell name will automatically update to display the spell that is currently selected. You can drag a new spell from your spell book or action bars into this icon slot to replace your selected spell.
Use this exact spell rank - Unticked (the default), any rank of the spell matches. Ticked, only the rank you chose matches. (only on Classic Era, TBC Anniversary, Forever)
Spell - This is a specific spell used in this condition. You may drag this spell from your spell book or action bars into the input field or spell icon to set this value. This input field has prediction enabled, so you do not have to type the full spell name, just select from the prediction frame when it appears.
Operator - How to compare Pet Spell Cooldown with the Seconds value. This comparison uses basic mathematical comparison operations.
Seconds - The number of seconds before you can cast Pet Spell.