When Janet panicked her dog Hercules could sense something was wrong he began to growl.

What is the best way to divide this sentence?
A.
When Janet panicked her dog Hercules. Could sense something was wrong he began to growl.
B.
When Janet panicked, her dog Hercules could sense something was wrong. He began to growl.
C.
When Janet panicked. Her dog Hercules could sense something was wrong, and he began to growl.
D.
When Janet panicked her dog Hercules, could sense. Something was wrong he began to growl.