They never complain. They suffer in silence and go through all misfortunes with dignity and we wake up when it’s too late. We lose our furry friends forever because we didn’t pay any attention to these signs in time.

Loss of appetite, weight loss. Often, loss of appetite is the very first sign of an underlying illness in pets. There can be many reasons your dog isn’t hungry or refuses to eat, but not eating can begin to negatively impact his health within 24 hours. And for puppies 6 months or younger, the issue is even more serious.

Lethargy, extreme fatigue. A lethargic dog will appear drowsy, “lazy,” and/or indifferent. She may be slow to respond to sights, sounds and other stimuli in her environment. If your pet is lethargic for longer than 24 hours, it’s time to make an appointment with your veterinarian.

Coughing. Coughing in dogs, unless it’s a one-and-done situation, generally indicates an underlying problem. Examples include a possible windpipe obstruction, kennel cough, bronchitis, pneumonia, heartworm disease, heart failure, and tumors of the lung. All causes of coughing require investigation, and in most cases, treatment.

Fever. If your dog’s temperature spikes, it usually means his body is fighting an infection. The normal temperature in dogs is 100.5 to 102.5 degrees F. If your pet feels warm to you and his temp is higher than normal, make an appointment with your veterinarian.

Difficulty breathing. A dog in respiratory distress will have labored breathing or shortness of breath that can occur when she breathes in or out. Breathing difficulties can mean that not enough oxygen is reaching her tissues. Additionally, dogs with heart failure may not be able to pump enough blood to their muscles and other tissues. Respiratory distress often goes hand-in-hand with a buildup of fluid in the lungs or chest cavity that leads to shortness of breath and coughing. If your dog has sudden undiagnosed breathing problems, she should see a veterinarian immediately.

Trouble urinating.This includes discomfort while urinating, straining to urinate, and frequent attempts to urinate with little success. If your dog cries out while relieving himself, seems preoccupied with that area of his body or is excessively licking the area, you should make an appointment with your veterinarian right away. There are several underlying causes of urinary difficulties, some of which can result in death within just a few days.

Bloody diarrhea, urine, vomit. Digested blood in your dog’s poop will appear as black tarry stools. Fresh blood in the stool indicates bleeding in the colon or rectum. Either situation is cause for concern and should be investigated as soon as possible. Blood in a dog’s urine, called hematuria, can be obvious or microscopic. Vomited blood can be either bright red (fresh), or resemble coffee grounds (indicating partially digested blood). There are a variety of reasons your dog might vomit blood, some of which are relatively minor, but others are serious and even life threatening.

Pacing, restlessness, unproductive retching. When a dog paces and seems unable or unwilling to settle down, it can signal that he’s in pain, discomfort, or distress. One very serious condition in which these symptoms are common is gastric dilatation volvulus (GDV), also called bloat. Another sign of bloat is when a dog tries to vomit but brings nothing up.

Fainting, collapsing. When a dog collapses, it means she experiences a sudden loss of strength that causes her to fall and not be able to get back up. If a collapsed dog also loses consciousness, she has fainted.

Either of these situations is an emergency, even if your dog recovers quickly and seems normal again within seconds or minutes of the collapse. All the reasons for fainting or collapsing are serious and require an immediate visit to your veterinarian. They include a potential problem with the nervous system (brain, spinal cord or nerves), the musculoskeletal system (bones, joints, muscles), the circulatory system (heart, blood vessels, blood), or the respiratory system (mouth, nose, throat, lungs).

Red eye(s). If the white area of your dog’s eye turns bright red, it’s a sign of inflammation or infection that signals one of several diseases involving the external eyelids, the third eyelid, the conjunctiva, cornea, or sclera of the eye.

Redness can also point to inflammation of structures inside the eye, eye socket disorders, and also glaucoma. Certain disorders of the eye can lead to blindness, so any significant change in the appearance of your dog’s eyes should be investigated.

Some symptoms of illness in dogs are best handled by simply giving them a chance to run their course, for example, a temporary GI upset resulting from indiscriminate snacking.

Other symptoms can be so sudden, severe and frightening that you know immediately you need to get your pet to the vet or an emergency animal hospital.

The 10 symptoms I’ve listed above are less definitive, so I hope I’ve provided you with some guidance in the event your own pet develops symptoms that point to a potentially severe or life-threatening illness.

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