OK...over being pissed....Homo Sapiens [us, humans, "wise man" ] are animals. A dog, horse, rhino, donkey, so forth, are animals as well. All animals have souls and spirits. If you believe [ that being the key word ] humans at death go to heaven, then it follows that all animals have a heaven as well.
However, that pesky little word believe is where the wheels fall off. A seemingly silly question about "Doggy Heaven" drives us deeper and deeper into how we know [ epistemology ] and a view that there is no rational way to justify ones beliefs: faith alone is necessary, nothing else [ fideism ] Faith then has lead us into: If this is true ( humans ), then how much more is that true ( Doggy Heaven ) or, a fortiori. Terry has asked a philosophical question, that will become circular in it's reasoning.
So, have fun. It's a great question and splendid exercise in logic.