How to Spot Sick Cattle: The Complete Observation Guide
Quick answer: The earliest sign of illness in cattle is almost always behavioral, not physical — separation from the herd, drooping ears, and reduced feed intake typically appear 12–24 hours before nasal discharge, cough, or diarrhea. Producers who learn to spot the behavioral changes catch illness a full day earlier and improve treatment outcomes dramatically. This guide teaches the DART system used in feedlots, normal vital signs to memorize, and the daily observation routine that works.
Why Early Detection Matters
Every hour matters. A calf treated for BRD within 12 hours of the first sign has a 90%+ recovery rate; the same calf treated 72 hours later drops below 50%. A scouring calf caught at Stage 1 dehydration recovers with oral fluids; the same calf found down at Stage 3 needs IV therapy and may not survive. A pinkeye lesion identified at Stage 1 heals with no scarring; the same eye at Stage 3 leaves permanent damage.
The single skill separating good producers from struggling ones isn't which antibiotic they choose or which vaccine they use — it's how early they detect illness. That skill is entirely learned. It costs nothing. And it's the single highest-return investment of your time on the operation.
The DART Observation System
DART is the standardized observation framework used by feedlot pen riders and cow-calf operations across North America. Four letters, four questions to ask about every animal you look at.
Head down, ears drooping, dull eyes, separated from the group, reluctant to move.
Not at the bunk, not grazing, not competing at feeding time, empty rumen (sunken left flank).
Rate above 40/min in cattle at rest, labored breathing, coughing, open-mouth breathing.
Rectal temperature above 103.5°F confirms fever. Below 100°F in a sick cow is a very bad sign.
Standard feedlot protocol treats any animal with 2 or more DART signs. Waiting for all four signs delays treatment past the point of highest response. Waiting for just physical signs (nasal discharge, cough) misses the early behavioral warning window entirely. Two out of four — pull, temp, and decide.
Normal Vital Signs
Memorize these numbers. They're the reference points that let you evaluate every observation you make.
| Vital Sign | Adult Cow (Normal) | Calf (Normal) | Concerning |
|---|---|---|---|
| Rectal temperature | 100.4–102.8°F | 100.5–103°F | >103.5°F (adult) or >103°F (calf) |
| Heart rate | 48–84 bpm | 100–140 bpm | Above upper range at rest |
| Respiration rate | 20–40/min | 30–60/min | >40 (adult) or >60 (calf) at rest |
| Rumen contractions | 1–3 per minute | – | Absent contractions = concern |
| Skin tent | Snaps back <2 sec | Same | >3 sec = dehydration |
| Capillary refill | <2 sec | Same | >3 sec = shock or dehydration |
How to take a rectal temperature
- Use a digital thermometer designed for large animals
- Restrain the animal in a chute or against a wall
- Tie a string with a clip to the thermometer's end — cattle lose thermometers rectally more often than you'd think
- Lift the tail, insert 3–4 inches at a downward angle
- Hold against the rectal wall until the reading completes
- Record on a chart or app with date and time
Reading Cattle Body Language
A healthy cow's body language is unmistakable once you know what you're looking for. So is the body language of a sick one. Train your eye on the healthy group at every observation — that's the baseline that lets you spot the outlier.
Signs of a healthy cow
- Ears alert, moving toward sounds
- Head up, engaged with surroundings
- Coat sleek and lying flat
- Eyes clear and moist, no discharge
- Full rumen (left flank rounded, not sunken)
- Standing squarely on all four legs
- Actively grazing, ruminating (chewing cud when lying down), or interacting with herd
Signs of a sick cow
- Separated from the herd, standing alone
- Drooping ears (BRD is classic — one ear droops before both)
- Dull, sunken, or discharge-covered eyes
- Rough hair coat standing on end
- Sunken flank, empty rumen (off feed)
- Head hanging low, back arched
- Lameness, favoring one leg
- Grinding teeth (pain)
- Groaning, moaning (severe pain)
Manure & Feed Intake
Normal manure
Well-fed cattle produce firm-to-soft, medium-brown manure with a "pancake batter" consistency — falls in a coiled pile 2 inches tall. Grass-fed cattle produce looser green manure; grain-fed cattle produce firmer yellow-brown manure. Learn what normal looks like on your operation before you can spot abnormal.
Manure changes to watch for
- Watery diarrhea: Scours, salmonella, nutritional imbalance
- Bloody or dark red: Coccidiosis, gastric ulcer, hemorrhagic bowel
- Mucus-covered: Intestinal irritation, viral infection
- Undigested feed: Rumen dysfunction, ration change, digestive upset
- Dry, hard "logs": Dehydration, low water intake, low forage intake
- Foamy: Frothy bloat starting
- No manure: Off-feed 24+ hours; usually a bigger problem
Feed intake as an indicator
Reduced feed intake is one of the earliest signs of illness — usually 12–24 hours before other visible symptoms. In feedlots, bunk-reading (evaluating how much of yesterday's feed remains) tells you when a pen is going off feed and prompts closer inspection. In cow-calf operations, watching who's at the mineral tub and who isn't is the equivalent early warning.
Daily Observation Routine
Morning check (highest value)
Cattle have been resting overnight and behavior differences are most obvious at first feeding or turnout. Walk through the herd slowly. Count. Look for separations, lameness, missing animals. This is when 80% of new sick cattle are detected.
Afternoon check
Focus on newly received or recently-worked cattle, cows near calving, and any animals you were watching from morning. Late-day heat stress becomes visible now.
Weekly deep look
Once a week, look every animal over carefully: body condition, coat quality, foot health, udder condition on lactating cows, discharge, injury. Weekly deep observation catches slow-developing problems (lameness, poor body condition, chronic BRD) that daily quick observation misses.
The Printable Sick-Cow Checklist
Daily sick-cattle checklist
- Are all cattle accounted for? Missing = investigate first
- Is anyone standing alone or apart from the herd?
- Are ears alert or drooping? (Look at every animal)
- Are eyes clear and moist, or discharging/sunken?
- Any nasal discharge — clear, cloudy, or thick?
- Any coughing? Rapid or labored breathing at rest?
- Anyone lame? Favoring a leg? Not putting weight down?
- Is everyone at the bunk or grazing? Anyone off-feed?
- Any abnormal manure? Diarrhea, blood, foam?
- Any bloat visible (left-side distension)?
- Any swelling on legs, jaw, brisket, or udder?
- If a cow is down: can she rise? How long has she been down?
- For calving cows: is calving progressing? Any signs of distress?
- For newborn calves: has each nursed within 2 hours of birth?
For every animal you see, ask three questions: (1) Is she doing what the rest are doing? (2) Does anything look different from yesterday? (3) If I saw this animal in the sale ring, would I buy her? If any answer is "no," take a temperature. It takes 30 seconds and pays for itself the first time you catch a sick cow early.
Frequently Asked Questions
What is the DART system for spotting sick cattle?
DART stands for Depression, Appetite, Respiration, and Temperature. An animal showing depression, reduced appetite, abnormal respiration, and fever above 103.5°F is a treatment candidate. Two of four DART signs is usually the threshold for pulling and treating.
What is a normal temperature for cattle?
Normal rectal temperature for an adult cow is 100.4–102.8°F, averaging 101.5°F. Anything above 103.5°F is a fever. Temperatures below 100°F in a sick cow suggest severe illness with declining metabolism — often a worse sign than a high fever.
How do you take a cow's temperature?
Use a digital rectal thermometer designed for large animals. Restrain the cow, insert the thermometer 3–4 inches into the rectum at a downward angle, and hold for the reading. Tie a string to the thermometer with a clip — cattle rectally lose thermometers often.
How often should you check cattle for sickness?
Daily observation is the minimum. Calving cows, newly received cattle, and hospital pens should be observed at least twice daily. Consistency matters more than frequency — cattle observed by the same person at the same time yield the earliest disease detection.
What is the first sign of a sick cow?
The earliest sign is almost always behavioral: separation from the herd, drooping head or ears, reluctance to move. Physical signs come later. Learning to spot behavioral changes catches illness 12–24 hours earlier.
This guide is part of the full Cattle Health & Disease pillar — covering every major disease, vaccination schedules, parasites, and emergency response.
Return to Cattle Health Hub →This article is educational and does not replace veterinary care. When in doubt about a sick animal, call your veterinarian — early consultation prevents most emergencies and costs less than treating a crisis.