Is your dog refusing to eat his favorite treats or run after his favorite throwball? Have you recently noticed signs of sudden and unprovoked aggression that were not there before? You should always be wary of signs like these as they may indicate that your pet dog is suffering from depression. You heard us right. The chances of depression in dogs are very real and the earlier it is diagnosed, the easier it shall be to treat. You should be able to quickly identify the symptoms to seek expert opinion and these infographics will give you the six key symptoms of depression.