What is a: Darkhound

Darkhounds are demonic dogs. This creature resembles a purple hunting hound with a shaggy black mane and a horrible set of fangs. Two horns sprout out of its forehead, and another pair emerges from its jaw.
These creatures frequent forests, traveling either by themselves or in small packs, hunting and killing any living creature as they find it. Unlike normal dogs, darkhounds kill for sheer joy of the kill; they rarely eat what they hunt.
Many warlocks instead keep the monsters as pets, training them to be even more lethal than normal. Darkhounds understand basic Demonic, but, being little better than beasts they cannot speak. Darkhounds stalk their prey, shadowing it for hours until a suitable ambush spot presents itself. They then dart out, attempting to bring down their victim with overwhelming numbers and sharp teeth.