A member of the public spotted the six-week-old tawny owlet in woodland in Bearsden, outside Glasgow.
The Scottish SPCA is looking after the bird until he has grown enough to be released back into the wild.
Animal rescue officer Stephanie McCrossan said: "The lady who contacted us said she saw two cats trying to attack the owl but thankfully he hadn't sustained any injuries.
"At his age he would have been starting to wander along tree branches so it's likely he's taken a tumble and gotten lost.
"Usually we would advise people to leave fledgling birds alone to allow their parents to find them.
"However, in this case there was no sign of a nest or mum and the owl was very vulnerable to predators, so I took him to our National Wildlife Rescue Centre for expert care."
Centre manager Colin Seddon said: "This owl is too young to be away from his mother but he's doing very well and is currently in one of our outdoor aviaries with six other owl fledglings.
"We're optimistic he'll develop well and be returned to the wild once all his feathers have come through and he is happy in flight."