Jealousy

Human scientists have recorded that dogs may be jealous, by testing them in a scientific environment. I think it is always interesting to know when science concludes that something exists, which is already part of common knowledge. We dogs know we can be jealous, of course. Humans who has a lot of experience of dogs know the same. Now we have scientific proof that this is true. It is like getting scientific proof that dogs in general have four lega, two eyes, and one nose.