This is not a Christian belief, Augustine and Aquinas (among others) openly believed animals, plants, even stones, had souls. A lot of mistakes regarding Christian theology is people mistaking something they heard '30 years ago' with a millennia old religion
I didn't mean it was an official position of the Church, just one that a lot of Christians have (or at least had fairly recently). Let's not no-true-Scotsman this.
The thread you posted is one guy who says animals don't have feelings and asking for a Bible verse to support it and a bunch of responders pointing out that animals obviously have feelings.
