Rascal a two-year-old dog has a foul odor. What could be the cause? Animal Rascal a two-year-old dog has a foul odor. What could be the cause? Answer: Any brownish material in his ears. He may have an ear infection, he has a tartar on his teeth or very red gums. His teeth need attention, his skin is very dry and has bumps. Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+