Well yes, just like any condition. The thing is people think because their dog cries and howls when then leave, then it's separation anx. Same if the dog is following them all over the place. Which it's not.
The panting is a dead giveaway. Dogs don't sweat, so if you see your dog panting and shaking like crazy when you come home, just picture a person shaking and sweating….you would know instantly that that person was breaking down.
Gizmo would be like that. He would be panting and shaking, whimpering and fast pacing back and forth not knowing what to do, when I entered the room after being away. He would claw and chew til his teeth bleed and paws bleed. Poop, vomit, urinate, destruction...you name it, he did it.
If you are interested then there are several good reads out on the internet to read on the subject. Books too, one that I liked, was I'll be Home Soon: How to Prevent and Treat Separation Anxiety. It's not a super book (actually it's more of a pamphlet than a book), but it does have some good general information on the condition and tips on how to battle it.
With Gizmo I had to end up using drugs. I had tried every Technique , and was getting nowhere. They helped to calm him down enough so the training took hold. But we are not 100% out of the clear yet. But it is far better now than it was in the beginning.