“Detecting signs of disease in pigs before severe symptoms appear can be the difference between successful treatment and heavy losses. Early detection of disease is the cornerstone of effective health management in pig farming. Research shows that subtle changes in behavior, appearance and condition often appear several days before obvious symptoms appear.”
Physical signs of a sick pig
The earliest signs of a sick pig often involve changes in appearance. Healthy pigs have shiny coats, while sick pigs often have rough, dirty or spiky hair. Additionally, pigs with light-colored skin may show a noticeable change in pigmentation – becoming pale, blue-purple or red – which is a key sign of circulatory problems.
When examining the appearance, focus on a few key areas:
- Head Area: Dull eyes, discharge, dry nose (sometimes cracked)
- Body Condition: Emaciated, sunken belly, noticeable weight loss
- Anal Area: Dirty rump, signs of diarrhea
In addition to changes in appearance, physical symptoms will also develop as the disease progresses. Coughing, difficulty breathing, or “thumping” are often signs of respiratory disease. Unusual discharge from the eyes, nose, vulva, or rectum also warrants immediate attention.
A change in stool texture is an important indicator of digestive health. Healthy pigs have solid, pellet-like stools, while diarrhea or constipation can be a sign of a variety of diseases. Additionally, if your pig is vomiting, it could be a sign of contagious gastroenteritis or a stomach ulcer.
Behavioral Changes to Watch for
A pig’s behavior is an important early sign of illness, often appearing before obvious physical symptoms. First, pay attention to changes in daily routine, as healthy pigs tend to maintain a steady rhythm and are always alert and active.
Sick pigs are often less active, spending more time resting than usual. They may isolate themselves, lying apart from the herd – this is an alarming sign because pigs are highly social animals. In fact, separation from the herd is often the earliest sign that something is wrong.
Changes in posture are also a reliable indicator:
Lying prone with ears down
Walking with an arched back and a tucked tail
Sitting in a “dog sit” position with labored breathing
In addition, changes in eating behavior are also early warning signs. Studies have shown that reduced feed intake often occurs before clinical signs of disease appear, which can be detected through automated monitoring systems. When pigs are sick, they also tend to change their drinking habits, often drinking less frequently but for longer periods of time.
The social interactions of pigs are also significantly reduced. Sick pigs are often less aggressive, and have reduced interactions with other pigs in the pen. They also show less interest in people, their surroundings, food, or water. Additionally, if your pig is not responding to sounds or playing normally, this could be a sign of a serious health problem.
When to Call Your Veterinarian
Understanding when to seek professional help is important for effective disease management. Some situations require immediate veterinary intervention, while others can be monitored for a short period of time.
Call your veterinarian immediately if your pig exhibits the following signs:
Complete refusal to eat
No stool for several hours
Distended abdomen
Depression or unwillingness to move
Difficulty breathing
Fever
In general, if the pig is still eating but eating less than usual, it can be observed for 24 hours before contacting a veterinarian. However, if the loss of appetite persists for longer than this, professional evaluation is needed.
Weight loss is usually not an emergency, but it still needs to be checked on a regular basis. In particular, avoid the common mistake of using multiple medications at the same time (such as dewormers and antibiotics) in the hope of “treating everything.” This approach often delays accurate diagnosis and effective treatment.
Lameness requires urgent attention if there are obvious signs of fractures, open wounds, or if the pig cannot support its weight on the affected limb. Most importantly, any pig that cannot stand should be examined immediately as this may be a sign of serious illness.
Daily observation of each pig is essential for early detection. By taking the time to closely monitor your herd, you will become familiar with small changes that can help identify potential health problems before they become serious.
