"Not a bit---"
Not a bit messy. My calico licks it right out of a plastic spoon and wants more. I just brought this home a few days ago so I can't rate the effectiveness of the product at this time. I'll come back in a month or two and give a review on that.
"Words great but messy! "
We buy this one because it is petroleum free and it works. We give it to our 19yrs old Princess every other day. Unlike the regular one with petroleum, this one makes for a mess when trying to apply to your finger and give to your cat. We found an easy solution. We use a needless syringe to give it and it works fine. Great item.