Wales Severn Bridge

Louise, 53, heard the window slide down but did not notice one-year-old Jack Russell Mouser was missing until it was too late.

The crash happened between junction 22 (M49) and junction 23 (Magor) of the westbound carriageway.

The Home Secretary has called on police to use new powers which include imprisonment to stop fuel protesters bringing gridlock to motorways and major A-routes