How many templates can be applied to a summoned creature(s)?

Question

How many templates can be applied to a summoned creature?

For instance the summon monster spell automatically comes with celestial or fiendish.

Say I was to use a rod of giant summoning with it which grants the giant template?

Answer 1

There is no limit.

Some creatures on the summon monster list will also have a template applied, such as giant or dire creatures. Even multiple templates before you even apply anything.

A few examples are:

1. Young frost giant
2. Dire Shark
3. Dire Crocodile
4. Human natural wererat rogue 2

So if you have anything that allows you to apply a template on the summoned creature, such as Skeleton Summons or Summon Good Monster, that template is applied on top of whatever template the creature already has.

For instance the summon monster spell automatically comes with celestial or fiendish.

Only those marked with an "*", which are mostly animals.