Let's stick with Alertness as a standard feat, and make Endurance a bonus feat.
Anything else besides flavor n' tactics?
Their limbs are moderately long, and their thoraxes proportional.[32] Along with African wild dogs, dholes are often referred to as "cat-like" canids, due to their long fine limbs and backbones.[30] They have great jumping and leaping abilities, being able to jump 3-3.5 m (10–12 ft) high, and leap 5–6 m (17–20 ft) long distances in one leap with a running start.[33] Their tails measure 16-17 inches long,[30] and are almost half the length of their bodies, nearly touching the ground when in full winter fur.[34] They are smaller than African wild dogs.[35] Adult males may reach 18 kg (40 lbs) in weight, with females being on average 4.5 kg (10 lbs) lighter. They stand 17-22 inches in shoulder height and 3 feet (0.91 m) in length.
From Wikipedia:
3 feet long, 1-1/2 to 2 feet tall, and 30-40 lbs.?
We may need a higher racial bonus for Jump. Their current skill modifier makes jumping those heights and distances difficult to impossible.
OK, I'm convinced.
The height/weight looks good.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.