Since "dog" is the male version of "bitch", it could be effectively the same insult. The best assumption for a random mysterious word is an insult, especially

Since "dog" is the male version of "bitch", it could be effectively the same insult. The best assumption for a random mysterious word is an insult, especially when used as name for you. If you don't know what "kike" or "tard" means and you assume it is an insult, you wouldn't be wrong.