Many times red ears are often accompanied by secondary yeast or bacterial infections of the ear which can be uncomfortable and frustrating to cure. (blog.petmeds.com)
The most common cause of red ears is underlying allergies, either to inhalant / contact allergies and / or -LSB-...] (blog.petmeds.com)
Swollen throat, red ear drums, swollen sinus or a sore throat are things parents can't diagnose. (babycenter.com)