A pet guard to transport pets in the boot (B) of a motorcar (C), comprising a barrier (10) for the reciprocal separation of the boot (B) and the cabin (I) of the motorcar (C) and means (20) to anchor the separation bar (10) to the motorcar (C). The separation bar (10) includes at least one substantially continuous optically transparent plate (11) to allow the driver of the motorcar to see behind the latter therethrough.