If a change in the body causes more change, but in the opposite direction the system is called
a. feedback inhibition.
b. positive feedback.
c. negative feedback.
d. neutral feedback.

It's a positive feedback system. An example is childbirth, where the cervical opening gets increasingly larger to accomodate the impending birth.

No it's not a contagious disease

Your dog can sniff at or even eat a bit of catnip. the herb is edible and not harmful. just don't expect them to roll around like a cat would! your dog may scrutinize catnip by licking and smelling at it, or be totally indifferent to this stimulant.