If you intend to chain summon pets, don't deal damage, or your next pet will have a harder time to regain agro. If you don't deal any damage, above strategy of dismissing pet while new one is almost summoned is just perfect to stay safe from any non summoning mob.
Also, if you chain fire pets, you will want to "back up" freshly summoned pet till it casts its innate damage shield (only does when out of combat), because it doesn't cast it instantly when summoned and you do want it on your fire pet to fasten the killing process
[You must be logged in to view images. Log in or Register.]