Here's some information I hope will help - it is taken from an article I wrote. Don't leave the dog in the backyard and consider it exercise. Long walks and hikes, of at least 30 minutes, twice a day, training, tracking and agility are a few other ideas. Length, intensity, and frequency will depend on your dogs age and physical condition. Tiring him out before you leave the house, can make him more relaxed about being left alone. Most of us have a routine we follow each time were ready to leave the house, and that can set your dog panicking, so change it. For example, he knows that when you put your coat on, you leave the house. Why not put your coat on randomly during the day, then open the mail. Grab your keys, and put them in a different place. After a few weeks with no discernible pattern, his separation anxiety may be less evident as you walk out the door. Never make a big deal out of coming or going, just leave and return that's it. Youll be doing him a big favour if you dont pay attention to him a few minutes before you leave, and for a few minutes after you get back. This shows him your absence is temporary, and nothing to be concerned about. Practice longer and longer absences by going side for a couple of minutes, than coming right back. Dont make a big deal out of it. If your dog suffers from severe anxiety, you may only be able to step outside for a second, before having to coming back in. If thats the case, than a second it will have to be. Once youre inside, go about your business for a few minutes, giving your dog a chance to relax. When you next go out, stay away bit longer. That might mean only 2 seconds, than 3 the next. Thats fine, just keep increasing. You can also vary the length of time you stay out. For instance say youve worked up to 7 minutes, the next time leave for 4 minutes, then 8, than 5. Within a few weeks, your dogs anxiety should be significantly reduced. The above suggestions take time to work, so for something more immediate until the other tips take effect, have some take him out during the day, speak to your vet about anti anxiety medication in the meantime, try one of those plug ins that help reduce anxiety. I've never tried it on a dog, but the one for cats worked wonders.