Instruct: Classify Amazon reviews into positive or negative sentiment
Query: HUGE waste of money

We have been feeding this supplement to our five dogs for about four months now with no benefit to any of them. Our Staffordshire Terrier was highly allergic to the supplement and had to immediately be taken off it. Our Lab/AmStaff mix has arthritis in her knees and we had hoped this might help her a bit, but she has not shown any improvement. Our Australian Cattle Dog mix has a coarse coat and sheds heavily, but this didn't help that problem either. We've tried feeding it to our horses, but neither of them will touch the stuff no matter what I mix it with. This product has been a HUGE, HUGE waste of money!