On our pre-existing world, after the Aquatic Update part one:

• Our dogs, cats, and birds seem to have lost ownership and are now just stationary in a sitting position
• We cannot un-sit them or interact with them
• All of mine have name tags, colored collars, etc. so they were labeled and had clear ownership.

The world is survival, multiplayer, on a realm.  Our world was never used with Beta or experimental gameplay.  The pets originated long before the Update Aquatic.

My other friends who play on the world can't use their pets either.