Quick Answer: Sudden generalized fearfulness needs a vet check first — pain and illness frequently cause increased reactivity and fear responses as the dog becomes more sensitized to stimulation. In puppies, this may be a developmental fear period (8-10 weeks and again 6-14 months). In adult dogs, sudden fearfulness without obvious cause should be investigated medically before behavioral intervention.
Most Common Causes
- Pain — any source of chronic pain increases overall reactivity
- Illness — systemic illness affects neurological state
- Cognitive decline — senior dogs may develop CDS (Canine Cognitive Dysfunction)
- A recent traumatic experience — sometimes owners miss the trigger event
- Developmental fear period — puppies acquire fears rapidly during these windows
Immediate Support
Reduce stressors, provide predictable routine, use frozen lick mats for calming, give a calming bed as a safe retreat. Do not force exposure to triggers during this period.
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