My 7 month puppy is back to being confined to one room of the house while we're at work (after being quite destructive last week).

So she's having a LOT of anxiety now, whining & howling when we come home and she barks when we leave. She's not distracted by food anymore which is a BIG chance for her Chat Icon

My question is: would a thundershirt and/or one of those pheromone collars or sprays help with this ??? Or should those just be used for shorter periods of time ? Because it'd be on her pretty much all day, 5 days a week. I guess I'm wondering if I use it too much would she get immune to to and it stop working ??

TIA