The character sheet only has a single damage value listed for pets - their "+% to All Damage" multiplier:
This means there's no field on your character sheet to show damage bonuses that are limited to a specific damage type, like the +% Physical Damage from Mogdrogen's Pact. Similarly, you won't see the +% Vitality Damage from Mythical Spirit Cannon. Only +% to All Damage (like from Occultist's Manipulation node, or the Subjugator's prefix) will show up in your pet stats on your character sheet.
Contrast with the section for your own character's damage, where each damage type is listed separately:
Bonuses to individual damage types apply to any damage of the appropriate type that's dealt by your pets (so the +% Physical Damage from Mogdrogen's Pact will apply to your Briarthorn's Physical damage, but not its Bleeding damage, since that's a separate type). They just don't show up properly on your character sheet, since it has nowhere to display them.