Hounds are a species of large canines native to the Kasslynian continent. They resemble various breeds of contemporary dogs but of a size comparable to real world horses. Hounds are used as steeds and beasts of burden by the people of Kasslyne.
There are two main varieties of hounds; The larger, bulldog-type one approximately oxen-sized,  which is used for pulling carts, and the smaller, more wolf-like saddlehound. They double as faithful steeds and ferocious guard dogs. Of course, both are kept as pets as well. 
First appearance of both: Ch. 2 Pg. 20