I find this old idea that animals have no emotions or a soul is very disturbing. I can’t guarantee that a dog’s soul will go to heaven, but anyone who ever handled an animal know that they have feelings too.
They certainly feel pain - and many animals like Elephants, Wolfs, Chimps and Dolphins have shown that they have a very rich social life as well. And there is no social life without relationships and feelings - no matter how primitive they are compared to ours.
Anyone how owns a pet like a dog or cat has seen them dreaming and do strange stuff while sleeping …