“Puppy dog eyes” and evolution

[DeusxMac]

"... a dog will have all of the basic emotions: joy, fear, anger, disgust and even love. However based on current research it seems likely that your dog will not have those more complex emotions like guilt, pride and shame."

As "worry" per se does not appear in this quantification, I'd propose that "distress", "fear" and "suspicion" could qualify as facets of worry.