My Border Collie has one front leg he overuses while ducking and diving when playing. This support gives the knuckle the support he needs while allowing him the freedom to carry on playing. Needed the help of his physiotherapist to fit the moulded sides to his paw, but once that bit was done, It’s been reasonably easy to fit the support onto his leg on a daily basis. Could have done with the medium size wrap being about a centimetre wider to make fitting easier. It just about goes round his leg but a large would have been much too wide. It does the job of supporting a weak joint paw as needed.