Disease Recognition

Part of Animal Husbandry

You cannot treat what you cannot identify. In a world without laboratory tests, your eyes, hands, and nose are your diagnostic tools. This guide teaches you to read the behavioral and physical signs that animals cannot verbalize.

The Baseline Principle

Disease recognition starts long before any animal gets sick. You must know what normal looks like for each species you keep, so you can spot abnormal the moment it appears.

Establishing Normal

Spend deliberate time observing healthy animals. Record (mentally or in a notebook) their:

• Resting respiratory rate — count flank movements for 15 seconds, multiply by 4
• Normal temperature — taken rectally with any thermometer
• Typical posture and gait — how they stand, walk, lie down
• Eating patterns — how fast, how much, how eagerly
• Social behavior — where they position in the herd, who they stand near
• Droppings — color, consistency, frequency

Normal Vital Signs by Species

Species	Temperature (F)	Heart Rate (bpm)	Respiratory Rate (breaths/min)	Rumen Movements/min
Cattle	100.5-102.5	40-80	10-30	1-2
Goat	101.5-104.0	70-135	12-25	1-2
Sheep	100.9-103.8	60-120	12-25	1-2
Horse	99.0-101.5	28-44	8-16	N/A
Pig	101.0-103.5	60-100	8-18	N/A
Chicken	105.0-107.0	250-300	15-30	N/A

Behavioral Signs of Illness

Animals instinctively hide weakness. By the time they show obvious distress, disease has often progressed significantly. These subtle behavioral changes appear first:

Early Warning Behaviors

Behavior	What It Suggests	Urgency
Separating from the herd	General illness — pain, fever, weakness	Investigate same day
Reduced feed intake	Digestive upset, pain, infection, dental issues	Investigate same day
Grinding teeth (bruxism)	Pain — especially abdominal	Investigate immediately
Standing with arched back	Abdominal pain	Investigate immediately
Repeated lying down and standing	Colic or severe discomfort	Investigate immediately
Head pressing against wall/fence	Neurological — possible toxicity or brain infection	Emergency
Circling or staggering	Neurological — listeriosis, polioencephalomalacia, toxin	Emergency
Excessive vocalization	Pain, distress, hunger, separation anxiety	Context-dependent
Tail held abnormally	Pain in hindquarters, early labor, infection	Investigate same day
Not chewing cud (ruminants)	Rumen dysfunction, fever, pain	Investigate within hours

The Isolation Test

If you suspect illness but are not sure, watch how the animal responds to normal herd activities:

• When the herd moves to water, does the suspect animal follow or stay behind?
• When fresh feed is offered, does it approach with the group or show disinterest?
• When you approach, does it flee normally or stand dull and unresponsive?

An animal that fails to participate in group activities is almost certainly unwell.

Physical Examination Procedure

When you identify a suspect animal, perform a systematic physical exam. Do this the same way every time so you do not skip anything.

Step-by-Step Field Examination

1. General impression (observe before touching)

• Body condition — thin, normal, fat?
• Posture — standing square, or shifting weight, hunched, head low?
• Breathing — rate, depth, effort, noise?
• Any visible swellings, wounds, or discharge?

2. Temperature

• Restrain the animal (tie head, have an assistant hold)
• Insert a thermometer rectally, 2-3 inches, hold for 2 minutes
• Fever (above normal range) = active infection or inflammation
• Below normal = shock, severe illness, or hypothermia

3. Eyes

• Bright and alert = healthy
• Dull, sunken = dehydration or chronic illness
• Yellow tinge to whites (jaundice) = liver disease
• Reddened conjunctiva = irritation or infection
• Pull down lower eyelid — mucous membrane color:

Membrane Color	Meaning
Bright pink/red	Normal, healthy
Pale pink/white	Anemia — blood loss or severe parasite burden
Yellow	Liver dysfunction
Bluish (cyanotic)	Oxygen deprivation — respiratory or cardiac crisis
Brick red/muddy	Toxemia, sepsis

4. Nose and mouth

• Clear nasal discharge = often normal (minor)
• Thick, yellow/green discharge = respiratory infection
• Frothy discharge at mouth = bloat or poisoning
• Drooling = mouth injury, foreign body, or toxin
• Check for sores, blisters, or ulcers on gums, tongue, and dental pad

5. Ears

• Warm and upright = normal
• Cold and drooping = poor circulation, shock, or severe illness
• Head tilting or shaking = ear infection or parasites

6. Skin and coat

• Run your hands over the entire body
• Feel for lumps, swellings, hot spots, or pain responses
• Hair loss patches = ringworm, lice, or nutritional deficiency
• Crusty or scabby skin = mange, external parasites
• Fluid-filled swellings = abscess, hematoma, or edema

7. Legs and feet

• Each leg should bear weight evenly
• Check hooves for heat, cracks, foul smell, or soft spots
• Swollen joints = infection or injury
• Reluctance to move = foot rot, laminitis, or injury

8. Abdomen

• Left side of ruminants: rumen fill and movement (place your fist against the left flank and feel for rhythmic contractions — 1-2 per minute is normal)
• Distension = bloat, fluid accumulation, or late pregnancy
• Tucked-up appearance = dehydration or chronic pain

9. Droppings and urine

• Observe directly if possible

Droppings	Possible Cause
Watery diarrhea	Acute infection, toxin, sudden diet change
Mucus-covered	Intestinal irritation, moderate parasitism
Blood in stool	Severe parasitism, coccidiosis, intestinal damage
Dark/tarry	Bleeding high in digestive tract
Pale/clay-colored	Liver or bile duct issues
Hard and dry	Dehydration, inadequate water intake
Contains visible worms	Heavy parasite burden

10. Udder (dairy animals)

• Check all quarters — compare temperature and firmness
• Express a stream of milk from each teat onto a dark surface
• Clumps, strings, watery milk, or blood indicate mastitis

Disease Pattern Recognition

Some diseases present with distinctive combinations of signs. Recognizing these patterns helps you act quickly.

Respiratory Disease Complex

Signs: Cough, nasal discharge (clear progressing to thick), fever (104-106 F), rapid or labored breathing, reduced appetite, drooping ears.

Common in: Cattle and goats, especially when stressed (transport, weather changes, overcrowding).

Action: Isolate. Keep warm and dry. Offer warm water with honey. Aromatic steam inhalation (eucalyptus or thyme leaves in hot water held near the animal’s nose) helps loosen congestion. Garlic in feed for antimicrobial support.

Enterotoxemia (Overeating Disease)

Signs: Sudden death or rapid decline — staggering, convulsions, bloating, bloody diarrhea. Often the fattest, best-fed animals in the group.

Common in: Sheep and goats given sudden access to grain or lush pasture.

Action: Usually fatal before treatment is possible. For surviving animals, drench with baking soda solution (1 tablespoon in 1 cup water) to neutralize rumen acid. Prevention is key: introduce grain or rich pasture gradually over 2 weeks.

Tetanus (Lockjaw)

Signs: Progressive stiffness starting from the wound site, rigid posture (“sawhorse stance”), erect ears, flared nostrils, inability to open jaw, hypersensitivity to sound and touch, spasms.

Common after: Deep puncture wounds, castration, hoof trimming, any dirty wound.

Action: Survival rate is low without antitoxin. Keep the animal in a dark, quiet, padded space. Administer muscle relaxants if available. Clean and flush the original wound. Provide water and soft food at head height. Prevention: clean all wounds thoroughly and keep animals in clean environments after any surgical procedure.

Milk Fever (Hypocalcemia)

Signs: Occurs within 48 hours of birthing, usually in high-producing dairy animals. Starts with restlessness and muscle tremors, progresses to staggering, then lying down unable to rise (“downer cow”), cold ears, and coma.

Action: This is an emergency. If you have calcium borogluconate solution, administer IV or subcutaneously. Without pharmaceutical calcium: drench with a calcium-rich solution — dissolve crushed eggshells (baked first to increase solubility) or calcium carbonate (limestone powder) in vinegar. Prop the animal upright (lying flat causes bloat). Massage limbs to maintain circulation.

Prevention: Do not overfeed calcium during late pregnancy — paradoxically, this suppresses the animal’s ability to mobilize calcium reserves at birth. A lower-calcium diet in the last 3 weeks of pregnancy, followed by calcium-rich feed immediately after birth, is the safest approach.

When to Consider Euthanasia

This is the hardest decision in animal husbandry, but delaying it causes unnecessary suffering and risks to other animals.

Consider euthanasia when:

• The animal is in uncontrollable pain with no prospect of recovery
• A contagious disease threatens the entire herd and the animal cannot be effectively isolated
• Broken bones or severe injuries prevent the animal from standing, eating, or drinking
• Treatment has been attempted for 5-7 days with no improvement

A swift, clean death is a humane act. A sharp blow to the forehead (cattle) or a cut across the throat severing both carotid arteries (all species) — performed decisively — ends suffering in seconds.

Record Keeping

Even without paper and pen, develop a system for tracking animal health events. Notch a stick, mark a wall, or maintain an oral record with another person. Key events to track:

• Date and nature of any illness
• Treatment given and outcome
• Deworming dates
• Breeding and birthing dates
• Any deaths and suspected cause

Patterns emerge over time. If animals consistently get sick in the same paddock, that paddock may have a parasite or toxin problem. If disease spikes after rain, your shelter ventilation is inadequate. Records turn isolated events into actionable intelligence.

Key Takeaways

• Know what normal looks like for every species you keep — you cannot recognize abnormal without a baseline
• Behavioral changes appear before physical signs — isolation from the herd and reduced appetite are the earliest reliable warnings
• Examine systematically — the same order, every time, so you never skip a body system
• Mucous membrane color tells you more than almost any other single observation — check the inner eyelid every time you examine an animal
• Some diseases kill in hours — bloat, enterotoxemia, and milk fever require immediate action
• Most diseases are preventable through clean conditions, good nutrition, gradual dietary changes, and rotational grazing
• Keep records — patterns in your health data prevent future losses