A few weeks ago, I bought a salt lick for my guinea pug. There is lots of contrary evidence online about whether or not salt licks are the way to go or not. Some say they're fine, others say they're unnecessary. "Unnecessary" is an understatement. After a few weeks of Sylvia nibbling on her salt lick, everything seemed normal. Then yesterday, she ate the whole thing and I found her dead last night. There is simply not enough information out there about salt licks and guinea pigs, and what info there is, is often contradictory. So, please, steer clear of salt licks if you value your piggy's life. I learned the hard way and don't know if I'll ever forgive myself.