Common problems with dogs' ears include infections, parasites and allergic reactions. Dogs' allergies to ingredients in their diets or to environmental triggers often make their ears itchy and uncomfortable. More »

When a dog's ears smell, it is usually a sign that an infection is present, according to Jon Geller, D.V.M. Bacteria and yeast are the most common causes of ear infections in dogs, notes WebMD. Ear mites, allergies, exce... More »

Some common health problems in dogs include ear infections, worms, fleas and dermatitis, explains WebMD. Dogs also tend to have digestive problems, which often result in vomit or diarrhea. More » Pets & Animals Pets Dogs

PetMD lists fever; loss of appetite; skin and mouth abscesses; pain; infections of the eyes, ears, skin and respiratory system; toxic shock syndrome; arthritis; itching and pus-filled lesions as staphylococcal infection ... More » Pets & Animals Pets Dogs

According to WebMD, compulsive tail biting in dogs can occur for a variety of reasons, including allergies, anxiety, dry skin, epileptic seizures, injury and parasites. There are also certain dog breeds that have genetic... More » Pets & Animals Pets Dogs

Puppies and adult dogs alike can often be found nibbling on each other's ears to show affection or submission. They also might be grooming each other to prevent ear mites, or snacking on each other's ear wax. More »

Healthy dogs shake their heads during routine hygiene practices, such as shaking off water, parasites and debris. Dogs also shake their heads in response to the discomfort or pain associated with an illness or injury. More »