If you are concerned about separation anxiety, you can actually start training them now. I recommend getting a webcam with a phone app. Leave the house and observe what your little one is doing. If you notice any separation anxiety, you can take steps to correct it.
I had a rescue yorkie who had separation anxiety. I would just observe her and make any necessary corrections and after some additional training, she was able to just relax and play a little and sleep a lot. |