To start with, let me tell you a really creepy story. As a child, I was going to sunday school. Once, I asked the teacher an important question: "Do animals go to heaven?" That's when something really scary happened; the teacher responded: "NO!" The truth is, I loved going to Sunday school and the teacher was pretty cool regardless our differences of opinions.
SO, WHAT HAPPENS TO ANIMALS AFTER THEY PASS AWAY?
All of this is open for interpretation since, scientifically, we still aren't sure. From different paranormal reports, we learn that there aren't only reports of encounters with humans but with various different beings and entities one of them being animals. In conclusion, if there is afterlife which I believe there is, the rules should be same for everything and everybody.
Thanks for a read!