FrontierVille 'Purple Dog' glitch stumps players, forum moderators

Have any of you seen that purple doggie on the FrontierVille homestead? You know, the one with the waggly tail ... and the word "Temp" painted on its body? Unfortunately, it appears that this purple pup is not for sale, but a coding glitch that appeared around the same time the Injured Critter Goals were introduced. Several players on the forums report seeing this Purple Dog and have been asking why, but the moderators' guess is as good as ours.