Just want to let you know what an amazing difference your Bioflow magnetic dog collar has made to Willow. She is now 9 years old and had started to slow down on her walks. She wears her Bioflow collar daily and is now eager to go out for her walks again and seems more comfortable. She has even joined the horses for some adventures on Salisbury Plain and to the beach, and will walk for over an hour every day! Great customer service when we had a problem with her first collar, which was resolved promptly. Thank you for creating such an amazing product!