The dog in the cartoon might be sad and die because of a tragic event like a natural disaster or a betrayal by someone it trusted. Maybe it was just part of the story's plot to evoke strong emotions from the viewers.
Maybe it's because of some sad events in its story or it's just designed that way to evoke certain emotions from the viewers.
Maybe it lost its favorite toy or got scolded by its owner.
Maybe it lost its favorite toy or got separated from its owner. That could make it sad.
Maybe it lost its friend or something bad happened to it.
Maybe it lost its favorite toy or got separated from its owner. That could make a dog sad in a cartoon.
Maybe it lost its favorite toy or didn't get the treat it was expecting.
It could be sad because it didn't get the treat it was expecting or was scolded by its owner. There are many possible reasons for its sadness.
Maybe it lost its favorite toy or got separated from its owner. That could be why it's sad.
It could be that they didn't get the treats they were hoping for or were separated from their friends. Those reasons might cause them to be sad in the cartoon.
Start with the basic shape of the dog's body, like an oval for the head and a rectangle for the body. Then add details like sad eyes and a drooping tail.