Subtle changes in normal behavior often serve as early biomarkers for disease:

| Behavioral Change | Possible Medical Cause | |------------------|------------------------| | Increased aggression | Pain, hyperthyroidism, brain tumor, rabies | | Lethargy/depression | Systemic infection, anemia, organ failure | | Polydipsia/polyuria | Diabetes, renal disease, hyperadrenocorticism | | Nocturnal vocalization (senior dogs) | Cognitive dysfunction syndrome (canine dementia) | | Reduced nesting/grooming (cows) | Mastitis, lameness, or early calving issues |

A framework used to understand why an animal acts a certain way:

| Concept | Definition | Clinical Relevance | |---------|------------|---------------------| | Ethogram | A catalogue of species-specific behaviors | Baseline for identifying abnormal behavior | | Classical conditioning | Learning through association (Pavlovian) | Explains fear of clinics after painful procedures | | Operant conditioning | Learning through consequences (reinforcement/punishment) | Basis for low-stress handling and training | | Sensitization | Increased response to repeated stimulus | Noise phobias worsen with each exposure | | Habituation | Decreased response to repeated benign stimulus | Used to acclimate animals to handling |

Chronic fear and stress during veterinary visits compromise animal welfare, create safety hazards for staff, and damage the human-animal bond. Principles include:

Veterinary nurses/technicians are often the primary educators for clients regarding behavior.