1)Usually fairly large, four-legged animal. They are (or should be) grazing animals, and therefore need large pastures or careful feeding if pasture is not available. Wonderful creatures (that do not smell bad, their shit smells bad, as does their urine, but they actually smell nice)
2)Drain of time and money, not uncommon to find horse owners who spend all their money on their horses. "My other car is a horse" is a common sight on POS cars. Or "Poverty is owning a horse"
3) "Front end bites, back end kicks, and they are uncomfortable in the middle"
My horse eats better than I do