While you are trying to find a medication or supplement that will help your dog with separation anxiety it is a good idea to keep them in a crate while your away. This will help decrease the chance that your dog will injure themselves or destroy something in the house.
Crate training is crucial in helping your dog with separation anxiety. By teaching your dog that their crate is a fun place to be and reward them for staying in their crate. This helps puppies get used to a space of their own that they can retreat to when they are stressed or tired.
By putting a puppy in their crate this allows the puppy to get used to being without their special family member. This trains a dog to spend time by themselves and that alone time is a good thing.
When leaving the house, do not make a big deal out of leaving or coming home. It is best to act like nothing is exciting about it. Eventually, your dog will get used to you leaving and coming home and you can then start making a big deal about coming home. When you leave, put your dog in their crate along with something with your scent on it such as an old worn tee-shirt or blanket.