In certain areas, seemingly chunk defined, we have found on our realm the sound of a wolf dying when you cross a certain chunk boundary, but there are no wolves around. This has been happening since 1.8.1 came out. We have checked for various things and cannot find anything that might be causing it, even closed & reopened the realm. Some of us can just avoid the area, but for others it is on their bases and very annoying.

Edited 11th Feb: Now in the same area there is a new issue, following 1.9.0's release - the dog death sound still plays, but also there are places where block placement is impossible. The block appears to be placed for a split second, then disappears. It remains in inventory.