My 20-lb 10-year old mutt's back legs ached whenever the weather got cold. He whined in pain, and could barely use his back legs in the winter. I got this for him and initially gave him half a pill in the morning and the other half in the evening. The pill crumbles when I cut it, but while it was very bothersome to do this, he puked whenever I gave him a whole pill, so I had to do it.