Shaco vs Hecarim Jungle Matchup

How to play as Shaco

Set boxes ahead of Hecarim's likely route or to protect a retreat, but don't rely on a triggered box to stop his R charge; pull back toward teammates when he commits.

Invade Hecarim early when you know his route and have lane support; if you lack that setup, trade across the map and avoid dying for a camp.

Shaco players report Hecarim's Onslaught of Shadows(R) can continue through Jack in the Box(W) fear, so a box triggered during the charge may not stop his entry.

Hecarim's Spirit of Dread(W) heals him while he damages nearby enemies; Shaco players describe his sustain and speed as making direct duels difficult.

Sources

These notes come from r/shacomains, checked against the champions' abilities.