2 days ago, we were at the park getting ready to do some training, and when he looked at me, I saw dried blood in his left ear. Yesterday, We were sitting around the living room, and I noticed he stunk. I'd smelled the smell before, so I knew it was an ear infection (My cat had that problem a couple times when she was alive.). Not to mention it's noticably redder in color than the other one. Well, I got him to the vet today, and I was right. They examined him, and took a swab of stuuf from inside his ear, and the doc said it was a yeast infection, likely from some water getting in his ear and not drying out good enough. So they gave me some Ear wash solution for both his ears, and some drops for the left one, to clear up the infection. I wanted to catch it as soon as I could, because I know if I let it go, he'll lose some or all of his hearing (I know that from some experience with my own ears.).