Instead of taking the listed benefit at 4th or 7th level, you can instead choose to increase the companion’s Dexterity and Constitution by 2.
Does this replace all the listed benefits for the 4th or 7th level advancements or just one of them? For example, a mastodon companion at 7th level becomes large. Could someone instead take the +2 dex instead of the size increase but retain the other benefits for 7th level? Or would it replace everything the mastodon gets at 7th level?
