what animal is stitch

Stitch is a fictional character from Disneys Lilo & Stitch franchise. He is a genetically engineered, extraterrestrial life-form resembling a blue koala. Although he is referred to as a dog throughout much of the franchise, he is not a dog but is actually a koala. Stitch is marked by his mischievous behavior, which endeared him to Lilo, who adopts him as her pet.