PigDog

a PigDog is a recently-discovered omnivorous canine exclusively inhabiting the castle. Named for its striking similarity to a common pig and a dog. Prof. Tim, the original discoverer of this new species named it “PigDog”, however its scientific name would be “Carnivorus Svinneris Vulgaris”.

Physiology
The PigDog is, like almost everything in the Castle, an extremely aggressive nuisance; it feeds on almost anything ranging from the recently deceased, the ancient deceased, bones, pieces of metal, rare flowers to its own kind. The PigDog is known to have the most flexible genes and DNA structure from any living organism; its genetic structure is able to be spliced with various other genetic coding to create multitudes of new species. The government has an interest in harnessing this natural ability to create new biological weapons from it.

Trivia

 * The name "PigDog" was an invention of Tim's, based on a quote from Monty Python and the Holy Grail