When God sends people messages through dogs (in the form of angels, spirit guides, or totems), those messages are usually ones of comfort.
People often feel overwhelmed by seeing angels appearing in their heavenly form (in fact, the most common greeting that religious texts record angels giving to people who see them in their glory is "Don't be afraid."). But when angels manifest in a physical form (usually as human beings, but sometimes as animals), people are far less afraid of them. It makes sense that God would sometimes have angels appear in the form of dogs to people in need of comfort, since dogs are such friendly, trusting, and loving creatures.
Then there are the stories of people's beloved pets appearing to them from the afterlife (as spirit guides or totems) to comfort them in their grief. Those who say they've been visited by a late pet say the bonds of friendship they've shared last beyond their pet's death.
People often wonder if dogs (and animals in general) go to heaven. I believe that they do. While human souls are different from animal souls in some distinct ways (for example, human beings are made in the image of God), animals do have souls -- and they have a loving Creator -- just like we do.
Has God ever delivered a message to you through an angel, spirit guide, or totem in the form of a dog? What happened? Leave your comments here on the blog, visit our forum to discuss it, or email me at firstname.lastname@example.org with a brief story to post on our site to inspire others!
On another note, I'm working on a group of articles about horses (which I'll feature later) and have just posted an article about the famous heavenly white horse the Bible describes in the book of Revelation.