Roe deer fawns are born May-June and hidden by their mothers for the first weeks of life, making them vulnerable to disturbance and predation.
Roe deer fawns found apparently alone are almost never genuinely abandoned - mothers are typically nearby and will return when disturbance ends. Human intervention, including picking up 'abandoned' fawns, causes the actual abandonment it was intended to prevent. Dog disturbance of fawns causes real abandonment. The most impactful welfare intervention is public education to prevent well-intentioned interference with fawns that are following a natural hiding strategy.