diff --git a/src/main.c b/src/main.c
index 4f31b2d..b2dcf9d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -27,6 +27,7 @@
 #include "power_mgmt.h"
 #include "battery.h"
 #include "coulomb_counter.h"
+#include "watchdog.h"
 #include <math.h>
 #include <string.h>
 #include <stdio.h>
@@ -42,6 +43,9 @@ extern volatile uint8_t  cdc_estop_clear_request;
 /* BNO055 active flag (set if BNO055 initialized successfully) */
 static bool bno055_active = false;
 
+/* Watchdog reset flag (set if MCU was reset by IWDG timeout) */
+static bool g_watchdog_reset_detected = false;
+
 /*
  * Apply a PID tuning command string from the USB terminal.
  * Format: P<kp>  I<ki>  D<kd>  T<setpoint_deg>  M<max_speed>  ?
@@ -119,6 +123,9 @@ int main(void) {
     HAL_Init();
     SystemClock_Config();
 
+    /* Detect watchdog reset (Issue #300) — must be before safety_init() */
+    g_watchdog_reset_detected = watchdog_was_reset_by_watchdog();
+
     /* USB CDC */
     USBD_Init(&hUsbDevice, &SaltyLab_Desc, 0);
     USBD_RegisterClass(&hUsbDevice, &USBD_CDC);
@@ -128,6 +135,11 @@ int main(void) {
     status_init();
     HAL_Delay(3000);  /* Wait for USB host to enumerate */
 
+    /* Log watchdog reset event if it occurred (Issue #300) */
+    if (g_watchdog_reset_detected) {
+        printf("[WATCHDOG] MCU reset by IWDG timeout detected. Main loop may have hung.\n");
+    }
+
     /* Init IMU (MPU6000 via SPI1 — mpu6000.c wraps icm42688 + complementary filter) */
     int imu_ret = mpu6000_init() ? 0 : -1;