why would greyhounds need them to run on sand lol i been out in all weather with the lad. They seem to stay on no issues.never seen him adjust them when out????? I think if you run flint or have a dog with feet probs i think there a no brainer reallyI'm on the phone so can't type out much so here's a link would the boots offer protection for any of these foot injurys or do they just protect the pads. http://www.mikeguilliard.co.uk/id15.html