The Pet character sheet does not display MRR value. Please add this to the pet's character sheet.
Defenses:
Unless you start to add additional equipment slots for pets, they need some help in their enhancements. To be honest, I would like to see a Defensive and Offensive tree built for them taking advantage of our current enhancement tree design, but that might be asking for a bit much at this point. So adding some values to the already granted enhancements might be a substitute for now.
On the PRR/MRR front. It would be nice to have some built in values for these. Add it to Adamantine Plating or Reinforced Armor. Something like 10/15/20/25 to both PRR and MRR (not cumulative) at Plating tiers 1-4 seems like an ok value. As a bonus, maybe at tier 3 or 4 adding immunity to Magic Missiles would be nice. This is slightly less than the four heavy armor feats Fighters can take.
Another nice option would be to add +Dodge/Dodge cap into Danger Avoidance. +2 Dodge and Dodge Cap at each tier seems ok.
Lets face it, the pet will never get a skill high enough to make Intimidate or Bluff worth it. Let us change Menacing Growl and Distraction to something useful.
--Menacing Growl can give +To Hit since Pets need lots of help in this department. +5 per tier does not seem over much. Or better yet, +3% per tier if you are feeling generous.
--Distraction should give Deception/Improved Deception abilities. Tier 1 gives Deception as normal. Tier 2 adds +2s to the Deception effect. Tier 3 adds Improved Deception (so we get two chances to proc). Tier 4 adds +2s to the Improved Deception effect.
Fixing the Augment problem on pet gear would help with some of these issues.
On a side note, if you don't want to or if it would be too much to add additional gear slots....with the fix to Augments, maybe you could add additional augment slots to pet gear. Give high level named docents (pet only) and pet collars the Thirteen treatment, with one augment of every variety. Something to consider.
Long term:
Pets don't gain any enhancements through Epic/Legendary levels from what I can tell. They gain Toughness and Natural Armor as they gain levels but it would be nice, especially with some of the above recommendations, to have some upgrades to them.
--Stat increases to Strength and Dex
--Increased Adamantine DR (Adamantine Plating)
--Sneak Attack: Attack and Damage (Skillful and Ruthless Deception)
--Level 30 ability like our own Legendary Feat choice at that level
P.S. The Wiki lists a bug at level 31 where it looses a lot of HPs. Has this been fixed and the Wiki is outdated or is this still a problem? Not there yet to test myself.