At best your stomach will drop like a stone as you wait for the page to load before you give a huge sigh of relief when you find it was just a stat change. At worst your beautiful, expensively painted pet has been altered beyond all recognition, usually into a species you really dislike.
As a true Neopian, this was something you might expect to encounter at some point. Unfortunately, we're unable to reverse this or restore your pet. Please take more care when zapping!