There isn't a stealth bar for druids as far as I'm aware of, as I have a level 85 feral (cat) druid myself and prowl quite a bit
I have two macros, which when in Prowl has a different action on those buttons than to when I'm not prowling. One has Ravage (Prowl) else Shred, and the other has Pounce (Prowl) then rotation.