Devilkiller |
Yeah, the Undersized Mount feat could be helpful. The Narrow Frame feat is good too. Cavalry Formation might help if your party will have more than one mounted PC. If you've got enough feats, Gang Up can work really well for mounted PCs and their allies.
raven1272 |
In my searching, I don't see a rule that specifically relates the size of the rider to the size of the mount. It can be inferred though.
In the mount ability for cavalier, samurai, etc.. it states that the mount must be of a suitable size. It also gives some very specific examples of what is suitable for small and medium cavaliers. Small cavaliers may choose the pony or a wolf while medium cavaliers may choose a horse or a camel.
In the equipment section, under mounts and gear, the riding dog is said the be a medium sized creature suitable to be ridden by a small humanoid. Under horse, it says that it is suitable for a human, dwarf, elf, and etc... and it the it goes on to say that the pony is smaller and suitable for the gnome and halfling.
So, the rule appears to "suitable as a mount" whereas the equipment section implies one size larger than the rider.
Run a search for "suitable mount"