It may be spooky or uncomfortable but RULE #1 from this trainer: Never 
Correct a Growl. A growl is an audible and obvious sign that your dog is 
uncomfortable and needs something to change.

Separation anxiety in multi-pet households

Can’t leave your dog alone? Tips, tricks, and thoughts about separation anxiety treatment from a certified separation anxiety trainer, certified professional dog trainer, and former zoo keeper at Smithsonian’s National Zoo bird house. Separation anxiety training, reactivity, and basic manners or behavior problems are all explored and explained for dogs, cats, birds, and more!