| 摘要 |
A pet training apparatus comprising a closed cylindrical container having first and second walls connected to a cylindrical sidewall, wherein the interior surfaces of the first, second, and cylindrical walls define an cylindrical interior volume with a minimum inner diameter and a longitudinal axis, and a plurality of metallic objects with said interior volume. In the preferred embodiment, the metallic objects are spheroids (e.g., BBs or bearings), with each spheroid of being identical in size, shape, and density.
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