bedrock-samples/resource_pack/render_controllers/leash_knot.render_controllers.json

{
    "format_version": "1.10.0",
    "render_controllers": {
      "controller.render.leash_knot": {
        "geometry": "geometry.default",
        "materials": [ { "*": "material.default" } ],
        "textures": [ "texture.default" ],
        "filter_lighting": true
      }
    }
  }