I saw it at a Short Film Festival about ten years ago. Might have been Brest’s Short Film Festival.
It takes place in a deserted block of flats , perhaps in eastern Europe. The colours are quite dull, but striking; i remember pale beige and pure black.
The short mainly consists of scenes in which numerous black sighthounds roam the buildings, scene after scene. There is no dialog, with only the sounds of the dogs ruffling through the trash, walking, fighting, yapping at each others.
At the end of the short, a siren makes the dog pack panick and run out of the building before it is destroyed. I think i remember it is somewhat implied that some of the dogs died in the destruction of the building.
Any leads ?