Druid ability · learned at level 20 · Nature

Mark of the Wild Rank 3

Mark of the WildRank 3

100 Mana30 yd range

Instant

Increases the friendly target's armor by 142 and all attributes by 5 for 1 hour.

Game files · build 1.60.1.70245Read from the WoW Forever beta client, build 1.60.1.70245.

Compared with Classic

Classic tooltip

Increases the friendly target's armor by 105 and all attributes by 4 for 30 min.

Data	Classic	Forever
effect 1 value	105	142
duration	30 min	60 min

What Blizzard said about Mark of the Wild, each line checked against the files.

Not in the files
Pets can no longer receive player buffs that increase their stats.
The files Mark of the Wild, Power Word: Fortitude, Arcane Intellect and Blessing of Kings carry no new pet restriction in 70245 compared with Classic Era, so the server enforces this rule.
Mark of the Wild Power Word: Fortitude Arcane Intellect Blessing of Kings Class deep dives: Hunter and Druid

69876 Sep 16First beta build we archived. No changes in the client files since.