I use pack goats and I am sold. They work great for the terrain I hunt in:
Pro's:
1. Low maintanance: Don't need to worry about food or water while hunting. I've gone on 6 day trips before without giving them food or water. They will find enough food (grass, leaves, bark, rocks

) and their bodies are very efficient in using water. After hiking out on 5 or 6 day hunts without water often times they still won't drink when we get to a creek.
2. Minimal investment in equipment: Pack gear is simple and cheap. The also just jump in back of my truck and away we go so no need for a horse trailor.
3. Safe: I've been around a few horse wrecks in the mountains and now horses scare me. Too much risk for getting kicked, bucked off or severely hurt in the hills. As said above, goats are just like dogs and very friendly. They also could care less about blood, meat or dead animals
4. Athletic: For the goats I have and in the steep terrain I hunt, 50lbs is top end. They are better with 40 lbs which having 2 goats is plenty for a high country buck hunt. Cliffs, downed trees, rocks it doesn't matter...if you can hike it the goats will follow.
5. Hands free: Goats don't like to be led. They prefer to lag about 20 yards behind and will browse as you hike. Once you get out of sight they run to catch up.
Cons:
1. Slower: They aren't the fastest pack animal. If you are in great shape you will have to go a bit slower than you want. I figure the goats go about the same speed I would if I were carrying the same wt.
2. Boarding: As mentioned above they are hard on fences, trees, and they will get out of most solid fences.
3. Pack wt: In my opinion elk are too big for goats. You would need a pack string of 5-6 goats to comfortably get an elk out with camp
4. They hate water: If the area you hunt in has a lot of large creeks or rivers you might have a problem getting them across.
5. Slow to mature: It takes about 5 yrs for a goat to be in their prime and you cant really pack anything with them for about 2 yrs.