corbinam
Moderator
Dawn, I don't have anything else to add to what everyone has said, but I am thinking of you and hope that things get better.
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I think the gate is a good idea. Gate him off in a different room and give him a stuff kong like Siliria suggested. Do this while your getting ready 15-20 minutes before. Do not talk to him or say anything other than putting him in the room. Start varying your departure cues. For example pick up your keys and don't leave. Put on your shoes and don't leave, put on your coat and don't leave. Since you say he starts the behavior as soon as he knows your leaving. You have to make it impossible for him to know your leaving. Practice this randomly during the day too. Be unemotional and boring.
On your return home, ignore him for about 5 minutes. Say nothing and don't interact in any way. When you let him out,don't pet him or talk to him at all for another 5 minutes. If you need to take him outside do that but be as bored as you can. That why you coming back is no big deal.
If he panics ignore him competely. Walk at away. If he goes to bite you, tell him off but not directly, turn your back on him and yell. He needs to know this is not proper. The biggest thing is to never comfort him when he panics.

Oh Dawn, I'm so sorry your having these problems with Chandler.
I have know quite a few herding dogs who had displayed such behaviors when the owner left, it is part of the herding instict to not let the pack break up. It could also be seperation anexity. Unfortunately you can not rule out organic problems in Chandler's case.
I think the gate is a good idea. Gate him off in a different room and give him a stuff kong like Siliria suggested. Do this while your getting ready 15-20 minutes before. Do not talk to him or say anything other than putting him in the room. Start varying your departure cues. For example pick up your keys and don't leave. Put on your shoes and don't leave, put on your coat and don't leave. Since you say he starts the behavior as soon as he knows your leaving. You have to make it impossible for him to know your leaving. Practice this randomly during the day too. Be unemotional and boring.
On your return home, ignore him for about 5 minutes. Say nothing and don't interact in any way. When you let him out,don't pet him or talk to him at all for another 5 minutes. If you need to take him outside do that but be as bored as you can. That why you coming back is no big deal.
If he panics ignore him competely. Walk at away. If he goes to bite you, tell him off but not directly, turn your back on him and yell. He needs to know this is not proper. The biggest thing is to never comfort him when he panics.
If the behavior is getting worse unfortunately , you may need to consider that a brain tumor is behind it.Prayers and good thoughts.

