Dark urine is commonly observed in dogs, and is often normal. The color of urine varies for healthy pets, but some illnesses and injuries can contribute to a color change in the urine along with other symptoms.

Difficulty breathing (dyspnea) is always cause for concern, so any dog who suddenly exhibits this symptom needs emergency medical care. Many conditions can cause dyspnea,

Diarrhea, or loose/watery stool, is a common symptom of many conditions in dogs which range from transient and non-serious to life-threatening. Diarrhea ranges in form and severity, and may contain blood, mucus, fat, visible parasites, or foreign matter.

Ataxia describes abnormal movement control of the limbs and body. Dogs with ataxia present with poor coordination while walking, loss of balance, and often appear dizzy.

The pupil is the dark circle located at the center of the iris (the colored portion) of dogs’ eyes. The size of dogs’ pupils varies depending on light levels. When one or both eyes dilate (when the pupil becomes larger), this is called mydriasis.

Difficulty swallowing in dogs, known as dysphagia, is a common symptom with many different underlying triggers.