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 »

The most common signs of illness in dogs are behavior changes, change in eating or drinking habits, fever, vomiting and diarrhea. Appearance changes can also signal illness. More » Pets & Animals Pets Veterinary Health

Symptoms vary based on illness, but vomiting, diarrhea, lack of appetite, lethargy, increased or infrequent urination, coughing, hair loss, loss of mobility, or any combination thereof can all indicate illness in a dog. ... More »

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

No one is entirely sure why dogs tilt their heads, but the leading theory is that it allows them to see or hear better. Some dogs learn to do it more often because the behavior is rewarded with attention from their owner... More » Pets & Animals Pets Dogs

According to the Fairmount Animal Hospital, rectal bleeding in dogs can be the result of any number of diseases or disorders of the colon, rectum or gastrointestinal tract, including anorectal disease, rectal prolapse, i... More »

Various reasons, such as hormonal imbalance, pesky parasites, skin problems and hormonal imbalance cause dogs to chew their tails. Calm and trained dogs who have never showed interest in their tails before may have skin-... More » Pets & Animals Pets Dogs