In October 1925, tensions along the border between Greece and Bulgaria reached a boiling point over an astonishingly trivial incident. A Greek soldier stationed near the border town of Petrich lost control of his dog, which ran across the demarcation line into Bulgarian territory. The soldier ran after his pet, crossing the border in the process, and was promptly shot by Bulgarian border guards.
This triggered a swift and disproportionate escalation. Greek troops launched an invasion of the Petrich region, capturing several villages and shelling local defenses. The clash quickly escalated into a full-scale border conflict with dozens of casualties on both sides.
Desperate to avoid a broader regional war in the Balkans, Bulgaria appealed directly to the League of Nations. The League acted with unusual speed and decisiveness, issuing an immediate cease-fire order and demanding that Greek forces withdraw. An international commission of inquiry was dispatched to investigate the incident.
The commission ultimately concluded that Greece had committed an unprovoked aggression and ordered the Greek government to pay 45,000 pounds sterling in compensation to Bulgaria for the loss of life and property damage. Greece complied with the ruling, and the troops withdrew. The Incident at Petrich, often remembered as the War of the Stray Dog, became one of the few undisputed successes of the League of Nations in preventing a full-blown war, demonstrating how minor diplomatic sparks could be snuffed out before engulfing entire nations.