Dogs - In general, IWs get along fine with other dogs, but should not be raised with aggressive breeds.
Cats, rabbits, etc. - This is a sighthound, bred for centuries to chase, hunt and bring down game, so do not assume small animals won't be chased (which could result in the smaller animal being injured or even killed). Some IWs are fine with cats, especially if raised with them; others are not. It is wise to evaluate each IW on an individual basis.
Horses - Hounds should be taught when small pups to respect the horse. Do not assume the hound will not chase the horse, which can result in grave injury to the hound.