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 There was always a delay in between summoning the pet and it casting its spells, of a random duration.  I think a dev once said it had to do with how many pet type mobs were up at the time, either in zone or server wide (I forget).
 Log onto EQmac with a mage and you will see this in action.  Sometimes it will cast very quicky, sometimes several (many) seconds will pass first.  Very classic.
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