I realized we never assigned a CR to this fella. CR 2 looks about right.
Here's the final stats:
Daphaenodon
Medium Animal
Hit Dice: 4d8+8 (26 hp)
Initiative: +2
Speed: 40 ft. (8 squares)
Armor Class: 15 (+2 Dex, +3 natural), touch 12, flat-footed 13
Base Attack/Grapple: +3/+5
Attack: Claw +5 melee (1d6+2)
Full Attack: 2 claws +5 melee (1d6+2) and bite +0 melee (2d6+1)
Space/Reach: 10 ft./5 ft.
Special Attacks: Trip
Special Qualities: Low-light vision, scent
Saves: Fort +6, Ref +6, Will +3
Abilities: Str 14, Dex 15, Con 14, Int 2, Wis 14, Cha 6
Skills: Listen +4, Spot +6, Swim +5
Feats: Improved Natural Attack (Bite), Run, Track
Environment: Temperate plains
Organization: Solitary or pair
Challenge Rating: 2
Treasure: None
Alignment: Always neutral
Advancement: 5-8 HD (Large), 9-12 HD (Large)
Level Adjustment: -
COMBAT
Trip (Ex): A daphaenodon that hits with its bite attack can attempt to trip the opponent (+2 check modifier) as a free action without making a touch attack or provoking an attack of opportunity. If the attempt fails, the opponent cannot react to trip the daphaenodon.
Skills: A daphaenodon has a +4 racial bonus on Swim checks.