Extreme tiredness, sleeping more, loss of interest in walks, play, or other activities.  

Refusal to eat, difficulty chewing or swallowing. Consider switching to soft foods.

Open mouth breathing, fast or irregular breathing patterns point to respiratory distress.

Lack of response to stimulation indicates limited awareness. Say goodbyes gently.  

Disorientation, wandering without purpose, getting stuck indicate cognitive decline.

Messy coat, unpleasant odor, and soiling inside suggest dog can no longer groom.

Restlessness, vocalizing, and following you closely seek proximity and reassurance.