Fantastic product. The AeroDawg helped my cockapoo Bender breathe, which improved his quality of life when we were at our darkest moment. It also kept him off of oral steroids which would have put additional unneeded stress on his system. The Flow-Vu really worked to show that the medication was being delivered. I couldn't imagine not having this feature as there would be no way of knowing if the medicine was being inhaled. Thank you for making this product available and helping Bender breathe.