Other causes of swollen ears in dogs
Injury. An injury to an ear may cause a mild swelling, you may also see a wound, hair loss or some bruising.
Allergic skin disease. If your dog’s ears are red, thickened and itchy this could be an allergic skin reaction, which should be checked by your vet.
Sudden allergic reaction. If both your dog’s ears become very suddenly swollen, red and puffy, they have swellings elsewhere (e.g. face, eyes, nose, feet) or are having difficulty standing up this could be a sudden, severe allergic reaction to something (anaphylaxis). If you think this is the case, call your vet immediately.
Ear infection. Ear infections don’t often cause swollen earflaps, they tend to cause a swelling inside the ear canal alongside pain, a smell and itchy ears.