Dogs are our loyal companions, and it's crucial to be able to recognize when they are unwell. There are several common symptoms that may indicate a dog is sick.

One of the most obvious signs is a change in energy levels. A healthy dog is usually full of vitality, energetic, and playful. However, when a dog falls ill, it becomes lethargic, listless, and may sleep excessively. It may also be more clingy than usual and show less interest in its surroundings.

Loss of appetite is another significant symptom. Dogs are often food - driven, but if they suddenly show no interest in their food, whether it's their favorite treat or regular meals, it could be a sign of illness. This may be due to various reasons such as gastrointestinal problems.

Fever is also a common indicator. Dogs normally have a higher body temperature than humans, usually around 38.5 degrees Celsius for adults and a bit higher for puppies. If the temperature exceeds 39.5 degrees Celsius, it's likely that the dog is sick. A fever can be associated with many diseases, some of which can be life - threatening.

Changes in the eyes can reveal illness. Healthy dog eyes are usually clean, bright, and have little to no discharge. But when a dog is sick, there may be purulent secretions around the eyes, dryness, excessive eye crusts, and bloodshot eyes. In addition, the dog may be photophobic.