Dogs are unable to describe pain or discomfort using words, but instead use behaviour as a means of communication to express the fact that something is wrong. Most signs of the disease are so subtle that they are easily missed, mistaken for moodiness, or attributed to fatigue or stubbornness. The ability to listen for small shifts in behaviour, mood or talking can help identify a problem early. None of these behaviours is a diagnosis, but they are the signals for “help me” to indicate your dog needs more time and care from you. Understanding these cues can help you act sensibly, monitor the development and call an expert.
Unusual Withdrawal

An ill dog will keep off family members, not play, or seek solitude. This pulling back is a common indicator of either discomfort or lack of energy, and it is a sign that your dog might be experiencing something wrong inside of it, even without any obvious signs.
Changes in Appetite

If your cuddly friend has lost appetite for meals or is eating less, and isn’t keen on their favourite treats, then that probably means something’s up. When a dog is sick or in pain, the loss of appetite is often seen as very common at a young age.
Excessive Sleeping

While dogs enjoy sleep, too much sleep or the duration of sleep could be an indicator of fatigue. When sickness attacks, the body needs to conserve energy. Therefore, the dogs will end up sleeping regardless of how much they sleep normally.
Restlessness and Pacing

Other dogs react to distress by pacing, moving around, or finding it difficult to relax. This behaviour can indicate discomfort or failure to get a comfortable resting posture.
Changes in Body Posture

Discomfort may be indicated by a hunchback, low head or rigid movements. Dogs can also change posture automatically to shield sensitive parts or decrease load.
Less Interest in Play

A dog that avoids playing or sporting very suddenly is not necessarily feeling well. The lack of interest commonly indicates the lack of energy or physical discomfort.
Excessive Licking

When something is wrong, dogs can lick some parts of themselves repeatedly. This behaviour may be a way of calming yourself down when annoyed or internally uncomfortable.
Changes in Vocalisation

Distress may be indicated by whining or whimpering, or by an odd silence. Depending on how they feel, dogs may change the rate of vocalisation when they are not at ease or even confused.
Clingy Behavior

Other dogs, when ill, develop an abnormally close attachment to their owners and stick near them as a form of comfort. It is not unnatural when one feels vulnerable and tries to find comfort.
Avoiding Touch

When your dog runs away to be petted or reacts with a reaction to handling, this can mean it is experiencing tenderness or discomfort. Diversions tend to have a direction towards the sensitive areas.
Slow or Reluctant Movement

Stiffness or weakness may be what makes it hard for your dog to stand, walk, or climb. Dogs can steal off to avoid unpleasantness.