well, it depends on the animal. If we are talking about digestive systems, which are all I know about, cows and sheep have 4 compartments in their stomach. Animals such as horses have a pseudoruminent system, which is like a ruminant because they can digest grass and silage. Almost all animals have a monogastric, which is what humans have. Hope this helps!
http://bit.ly/1leBPcO <- this, especially the pics at step 1 and 2. You can change it to different 4 legged animals by changing the fur :3 but the bone structure is mostly the same
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