Did you know toys have hearts?
Many people can agree that Yoda is the most loving character there is. There are two ways to get to that conclusion. The first one is to watch Star Wars and see how endearing Yoda is. The second way is way more violent: purchase a Yoda doll, cut it open, and search for his heart in between the padding.
As we saw in Toy Story, toys have emotions. We can only assume that kind of heart that lives in Woody or Buzz’s chest is the same red squeaky heart the dog found in that Yoda doll after tearing it up.