K9 may be The Doctor’s most loyal companion, but working within the limitations of what amounted to a glorified, disguised remote controlled toy car, was challenging at best. Apparently the people who designed K9 to function only in the most ideal of studio controlled conditions missed the memo that mandated that nearly every other episode of Doctor Who would be filmed in a quarry. There was just no way K9 could cope with all those obstacles, let alone deal with a Dalek at the same time. But fear not, a mobile robot animal is in development.
Boston Dynamics has developed WildCat. WildCat is capable of bounding, and galloping at speeds of up to 16mph.