Summarize the following:
Towards death, from a few days to a few hours, you will notice that the dog's breathing will become shallow, with very long intervals in between breaths. The normal resting breathing rate of 22 breaths/minute may drop to only 10 breaths/minute.  Immediately before dying, the dog will exhale deeply. You may be able to feel your dog deflate as her lungs collapse. The dog's heart rate will drop from the normal 100 to 130 beats per minute to as low as 60 to 80 beats per minute, with a very weak pulse. In the final hours, you will observe that your dog breathes shallowly, and will not move anymore. Most of the time, your dog will only lie in a dark or hidden corner of your house. If your dog is dying, he/she will show a very clear loss of appetite. There will be virtually no interest in eating and drinking water. As death nears, the organs like the liver and kidneys are slowly shutting down, making your dog lose digestive functions.  A dry and sticky mouth, due to dehydration, can be observed. You may also notice vomiting. The vomit usually will contain no food, only frothy or sometimes yellowish to greenish colored acid, due to bile. This also comes as a result of loss of appetite. Twitching or involuntary spasms of muscles can be observed as your dog weakens due to loss of glucose. There will also be a loss of response to pain, and loss of other reflex actions will be observed.  When your dog tries to stand or walk, you will notice a lack of coordination and staggered walking. Possibly, your dog will not be able to walk at all. Your dog may lose consciousness or go into a coma immediately before death. Dogs that are nearing death and have suffered a chronic or prolonged illness may have a very skinny, emaciated look. Your dog may lose muscle mass, and the muscles may become very small and atrophied. Another sign is an uncontrollable bladder and anal sphincter control. Towards death your dog will urinate and defecate without control. Even the most disciplined or well-trained dog is likely to experience these symptoms.  Urination will be uncontrollable and with little volume. Nearing death, the dog will pass liquid diarrhea that is sometimes foul smelling, and sometimes blood tinged. After dying, your dog will urinate and defecate for the last time because of total loss of muscle control. Skin will be dry and will not return quickly to its original shape when pinched. This is due to dehydration. Mucous membranes like gums and lips will be pale. When pressed, they will not return to their original pinkish color even after a long time (1 second is the normal return time for gums to return to the original color).
Observe respiratory symptoms. Recognize the digestive signs. Notice how his muscles work. Pay attention to their bathroom habits. Assess the condition of your dog's skin.