Mule
Speed 40 ft.
Carrying Capacity 420 lbs.
Strength 12
In order to be used as a mount, a creature must be at least one size category larger than you, and must have an Intelligence score of 4 or lower. You may be able to convince creatures with a higher Intelligence score to let you ride them, but they are considered independent creatures (not mounts).
You can utilize a mount as a pack animal instead of riding it. A pack animal can carry a number of Supply based on its size (see Tracking Supplies in Chapter 4: Exploration of Trials & Treasures) in addition to its normal carrying capacity, and it can carry a number of bulky items equal to its Strength modifier + 1. If you intend to ride a mount as well as carry items with it, it can only carry half as many Supply and bulky items.
Many beasts commonly used as pack animals and mounts are especially adept at carrying heavy loads, and animals such as horses and mules have a much higher carrying capacity than their Strength score would normally provide.
An animal pulling a drawn vehicle can move weight up to 5 times its carrying capacity, including the weight of the vehicle. If multiple animals pull the same vehicle, they add their carrying capacities together.