Types of farts
The questions

What kind of animal farts the most?

The most farting producing animals are termites. Next in line are the camels, than the Zebras, the sheep, the cows, the elephants, the dog (Labradors/Retrievers), the humans + Cowpea*.
*Cowpea is one of the most ancient crops known to man. Its origin and subsequent domestication is associated with pearl millet and sorghum in Africa. It is now a broadly adapted and highly variable crop, cultivated around the world primarily for seed, but also as a vegetable (for leafy greens, green pods, fresh shelled green peas, and shelled dried peas), a cover crop and for fodder.