They suffer from anxiety due to separation. If separated from their owners, they will be sad.
The only thing that can Australian shepherds from anxiety is a lot of activity.
Don't interact with them for too long or show them avoidance and they can have anxiety issues.
The playing breed may seem good being themselves, but they can't be left alone.
The reason for their anxiety is being away from their owners.
Another great dog breed but they don't like to be alone, resulting in anxiety issues.
You should not leave them alone for too long, because they are too much attached to their humans.
Cocker Spaniel can act differently if you leave it for too long.