crw910, welcome to the forum.
Your dog does not necessarily suffer from separation anxiety. Some dogs are just more vocal than others. I have a few questions that may help others help you:
How long is the dog left in the crate on a regular basis?
What does the dog do after you're gone?
Are there any other symptoms of anxiety?
How does the dog behave when you're home? Is he anxious, or calm and confident?
How do you respond to his vocalization?
What is the dogs overall level of confidence?
Does covering the crate help?
Have you worked on seperation, as in specifically working on shorter to longer periods of seperation?
It's not easy to offer help without more detail. On the other hand, it's not easy to offer detail when you may not know what is important
