I believe 狗 have souls. I believe tht my dog amber is still with me in my 心 and tht she left a little bit of her soul and kind 心 for me until I met her again someday. :)
I don't think people have souls that go to heaven 或者 狗 likewise. I think we all just end up decaying in a whole.However if someone had a soul that deserved to go to heaven this would probably be 狗 and not people.Dogs can't talk, but with words I hurt people so easilly, and when someone tries to comfort me even the sweetest words just alienate me.On the other hand my dog only with a look,much 更多 sincere than words can wipe away all my sadness and make me feel better, while he really hasn't anything to earn, and even if he had he wouldn't know. And 狗 are like that without relegions telling them that if they are good they will go to heaven, if bad they go to hell.
I don't think they go to heaven, 动物 are just God's creation and a speaking vessel sometimes. I don't think 动物 have a place to go after they die. In Job, we read about how God takes care of his creation but he never states that they will have a happy ending 或者 that their is a place for them to go. This is a KJV Christian perspective.
Other religions may have a afterlife for 动物 but as far as 基督教 goes I challenge anyone that says 动物 或者 pets go to heaven