I'll make this brief. My chihuahua of nine years has grown a couple old warts over the last few years. I've monitored frequently and had seen a steady increase in one wart. It has never seemed infected and irritated until now. It was inflamed at first, but I was convinced he had accidentally scratched it or rolled in the grass. My dog hasn't been acting abnormal and has a good appetite. Now that it is split open and infected, I'm concerned on what it is and what to do! Any help! Thank you!