Im fostering a ginormous pit bull straight from the shelter...hes only 12 mos. old and spent most of that time in a crate. Needless to say, he has been crazy in the apt., tearing up magazines, storage containers, and shoes galore, as well as barking nonstop. I bought this app thinking maybe it would help him settle down, and its like some sort of auditory Valium/Ambien...three minutes of "Trickling Cavern" and hes out like a light, regardless of what Im doing, the other dog is doing, or whats happening in the hallway. In short, this app is magical!