One of my Rotties had a discharge in one of his eyes. We thought it was allergies, but it continued. So, we took him to our Vet and it was the inner eyelid irritating his eye. Rotties seems to have this problem. This was all new to me. He was my second Rottie and we didn’t have that problem with our first Rottie. Check w/ your Vet. He had 3 eye surgeries to finally correct the problem. I hope this isn’t your problem. Good Luck. I love Rotties.