A "training tool" refers to something that helps people learn or practice skills and knowledge. It is an item or resource used to train or develop abilities. Full definition
While not necessarily designed as training tools (some are; some aren't) the following are products that — in my opinion — all dogs should have. (samthedogtrainer.com)
The crate, or kennel, is an important dog training tool as well as a safe means of confinement. (thesprucepets.com)