divine hunter pet Spell Resistance

[Cavall]

The hunter has an archetype I plan in taking called the Divine hunter. (I plan on scalykind and boost it with the same rules provided with the animal domain, but that's neither here nor there.)

The divine hunter has his pet gain a template based on alignment.

Otherworldly Companion (Su)

At 3rd level, a hunter's companion takes on otherworldly features. If the divine hunter is good (or worships a good deity), the animal companion gains the celestial template...

under that template it gains spell resistance equal to its CR +5.

This gets raised by one at 5 HD because it's CR raises by one.

"SR The creature gains spell resistance equal to its new CR +5"
And
"A celestial creature's CR increases by +1 only if the base creature has 5 or more HD."

But what's it's actual CR? It's HD?

So a 9 HD pet would have a 15? 9 + 5 + 1?

Just want a concrete answer for my little venom spitting saurian loving dwarf. Oh, and Ankylosaurus for those that wonder.

[Captain Zoom]

I don't know the answer.

What I use is the Animal HD = CR table in the Monster Creation rules in the Beastiary to determine the CR of my animal companion for the purposes of any ability (usually SR) which is expressed as "CR +5".

So, a 5HD Animal Companion would be CR 4 on the table, but then get +1 CR from the template, so would be CR 5.

A 9 HD animal companion would be CR 6 on the table, then +1 for the template, for a total CR of 7.

If there's a rule somewhere that I'm missing, I'd like to know as well, but that's what I've been using.

[Cavall]

Hmm. That may have to be the closest thing I'll get to an answer. I can't imagine that a 13 HD creature is the same as a 13 HD companion given the extra bonuses, but there we are.

Thanks. If anyone else has thoughts I'd love to hear it.