I don't know when this happened. Just a moment ago my dog started to scratch his ears kind a rough,I though it was weird so I check his ears and I see this.
What happened here ? I'm really worried about my dog.
This is excessive ear wax, probably due to an ear infection.
You can try cleaning the wax with a moist cotton swab. There are special dog ear cleaning solutions that can dissolve the wax and some have additional beneficial properties. Most dogs are more accepting of ear cleaning when you mimic a licking motion. Never use Q-tips / cotton buds in a dog's ear because the risk of injury is too high.
If the ear wax returns within a day or two, your dog shakes his head a lot or rubs and scratches his ears, you should visit a vet. Ear infections can be caused either by ear mites, bacteria or fungi and the vet needs to determine the cause to give you the correct treatment. As treatment you usually get ear drops that numb the itching and fight the germs. If an infection is not treated, it can become chronic, sometimes lasting several months and in extreme cases the dogs have to get surgery to remove the focus of the disease.