Gracie has recently showed signs of her age, with greyhounds and especially the larger ones back leg issues are a thing as they get older, I spoke to my vets about what our first step should be and they suggested joints supplements before prescribed medication permanently so we have somewhere else to go if that doesn't work, while I was waiting for the supplements to arrive I also got a bio flow collar and although she has a ton of beds a new memory foam giant bed for her (which of course she thinks is rubbish lol) I didn't think the bio flow collar would do anything and was very sceptical, but I knew it wouldn't do any harm, I was quite surprised there seemed to be a mild improvement, nothing massive but less discomfort, because we went the supplement route it's takes a while to get into the system, with both she's doing much much better, I took the collar off for a few days because I completely forgot to put it back on after grooming her and noticed she was a little stiffer still didn't twig I hadn't put her collar back on because mine are naked at home all except Gracie with that collar, I've popped it back on again now and she's been fruit looping around the garden again! I wouldn't say it works miracles but I wouldn't say it doesn't so anything either based on Gracie, but she's the only dog I've ever popped one on so don't have a good range for comparison I would use one again though to see,