I’d like to give this a shot – I’m sure I once read a book that had surreal dog-themed stories. I remember it being a compilation of short stories without illustrations. My brain is telling me that one of the stories involved a boy who swaps bodies with his dog, and another one was about a dog getting cryogenically frozen. I think there were more stories besides those two, and I think they all involved dogs in some way, but I can’t be sure since those are the only two stories that come to mind. I don’t know when the book came out, but I would’ve read it around 2003-2005. I don’t think it was new at the time, so it would’ve been published before then. And I think the author was a man, but I’m not entirely sure of that either.