What makes you so sure? We know for a fact there are horses in heaven why not dogs?
55
Saint John sees the heavens open, revealing a white horse that symbolizes victory. Its rider, called "faithful and true," is usually understood as Christ. Following him are the armies of heaven, all riding white horses.
You can see symbolism all day long if you want, I will take this literally. We are warriors.
RUST
You said specifically using only those letters. Not, using only those letters multiple times.
I see that now.