Visited with Tilly Dog park field notes
Corporal Nathan Cirillo Free Running Area
An unfenced free-running area in Ancaster with trails, grass and a creek where dogs splash and swim.

The short version
Corporal Nathan Cirillo Free Running Area sits near Golf Links Road in Ancaster, beside the SilverCity area.
The area is unfenced, with wooded natural terrain, grass, walking trails, benches and a natural water source — a creek along the edge where dogs wade and swim together.
Tilly's creek videos are from here: wading in with a crowd of new friends on a September evening. Because it is not enclosed, it is only for dogs with reliable recall; confirm current rules before visiting.
Unfenced designated free-running area with a natural creek for swimming. Reliable recall is essential; confirm current rules before visiting.