The Pope didn't say that - but he could have.
He didn't say cats go to hell either. That is so not funny. Think of the St. Bernard Alpine Rescue Cats. And don't forget - there are Dominicans* in heaven - some are canonized saints.
Alpine Rescue Cat.
Will there be animals in heaven? If you want them there, of course. Even Fr. James Martin, SJ agrees. (Fr. Martin is kind of a poodle himself.)
That said, everything we need will be found in God - all our desires will be met. Our Lord has promised a new heaven and new earth - all creation is renewed - nothing will be lacking in God. Why is that so hard to get? Why do people torment themselves with these questions? Seek first the Kingdom of God and his righteousness and all of these things will be added to you.
A more pertinent question may well be: "Do catty people go to heaven?"
What about Pitbulls?
*Dominicans - aka God's dogs.
Song for this post here.