A Mount problem

[HammerBrother]

In addition, a 7th-level or higher Medium beast rider can select any creature whose natural size is Large or Huge, provided that creature is normally available as a Medium-sized animal companion at 7th level (like a bear). To generate statistics for such a mount, apply the following modifications:

Size Large
Ability Scores Str +2, Dex –2, Con +2;
Increase the damage of each of the mount’s natural attacks by one die size.

Would this stack with the Animal Companion growing large by level 7?

[Umbranus]

HammerBrother wrote:

In addition, a 7th-level or higher Medium beast rider can select any creature whose natural size is Large or Huge, provided that creature is normally available as a Medium-sized animal companion at 7th level (like a bear).

As it has to be medium at level 7 it can't work with a size increase at level 7.

[HammerBrother]

Umbranus wrote:

HammerBrother wrote:

In addition, a 7th-level or higher Medium beast rider can select any creature whose natural size is Large or Huge, provided that creature is normally available as a Medium-sized animal companion at 7th level (like a bear).

As it has to be medium at level 7 it can't work with a size increase at level 7.

ok the mount i was going to take was a tiger

[Umbranus]

You can have a medium tiger at level 7 because you can choose to have +2 con +2 dex instead of the normal level 7 increase. (it's in the section about ACs) so you'd have to take that kind of tiger and make it your beastial mount.

But some GMs might not like doing that. Because you willingly take a smaller companion only to make it large by other means.