What the dog is having is a cluster of seizures. That is the way Snoopy started out - and they never did find out what causes his. Sometimes they just can't. You can have expensive tests done and still not know what caused them. They started Snoopy out on a low dose of phenobarbitol - now he takes a stronger dose of Phenobarbitol and Potassium bromide. We also have the valium so he won't cluster.