Unless you are planning on rescuing an older, calm dog I would not recommend getting another yet. A puppy will learn the bad habits of your SA dog even though they are not done out of seperation anxiety. My toller had SA badly when we rescued her. Our older dog seems to have calmed her a lot though. Also I stopped letting her up on my bed at night until she learned to be alone for short periods of time. Correcting SA is a time consuming process. Just start with leaving for small periods of time and start getting her used to the routine you go through before you leave the house. Autumn used to be able to escape any crate so we shut all the doors to rooms we didn't want her in. She discovered the joys of stealing big bags of dumdums and it seems to consume most of her alone time. I don't recommend giving your dog rawhide unsupervised or any other toys that she can get pieces or chunks off of. Autumn doesn't get any toys when I am away because she will shred them. I've had her 5 years and she still has some anxiety, but I keep her so busy when I am home that she is happy when I go away. She gets a quick run before I leave so she doesn't have so much energy when I am gone. It will take a long time, hang in there and good luck.