Look, I’m going to go straight from the Bible here, skip all the “god is real god is not real” stuff.
Look, if God is real and he created all of everything, why in the hell would he also decide that nearly every living thing would suffer forever? The only two reasonable explanations are that no animals go to heaven or hell and they don’t have souls and heaven is purely for humans, or they will be pardoned because one that doesn’t know good from evil cannot be damned. Not to mention, have you not read Genesis 2? It’s literally Adam and Eve who are perfectly fine but once they know good from evil, suddenly that knowledge allows them to be damned. If a dog or a cat can’t know good from evil, why would they ever be damned?