Previous research has examined the effects of morphology on the way people perceive the traits of others. There also exists debate in the literature about whether morphological features influence the way people perceive trainability of dog breeds. The current study combined both of these aspects and investigated their applicability to human perceptions of the traits of robot canines. Participants were required to rate 54 morphologically manipulated images of robot canines on traits of strength, speed, agility, intelligence, aggressiveness, loyalty and trainability. The set of images consisted of every possible combination of two face colours, three ear shapes, three face shapes, and three eye colours. Eye colour, face shape, face colour and ear shape were all found to have significant influence on trait perceptions. Implications in regard to the field of robotics and the selection of working dogs are discussed.