Dogs are very possessive of their family, which they see as their pack – they are willing to protect them from anyone and anything, which is why they often become anxious and bark when strangers come to visit. They’re also quite possessive of their place in the pack, and they’re aware of the pack (or the family’s) hierarchy.
When this family built a Lego model of their dog (which, we have to say, is very impressive) this dog (understandably) thought he was being replaced. The worst part is, he thought he was being replaced with a new, younger version of himself! The unimpressed look on his face is all the proof you need to know that dogs get jealous.