Gargoyleosaurus was a somewhat smaller ankylosaur than its descendants and later cousins. Measuring in with a skull approximately 29cm (11in) long, Gargoyleosaurus' skull was approximately the size of a squirrel (minus the tail). The entire body of the dinosaur was estimated to be up to 4m (13.1ft). The largest Ankylosaurus were estimated to be as long as 10.6m (35ft); about 2.5 times the size of this early member of the family. Estimated weights, likewise, are radically different for this smaller ankylosaur. Gargoyleosaurus was estimated to weigh 1 tonne (2,200lbs) whereas Ankylosaurus was estimated to weigh in at approximately 6.8 tonnes (15,000lbs). Aside from the weight and absolute length of Gargoyleosaurus, the dinosaur was about the size of some common livestock. It could have certainly made an interesting large pet.