Depends on the dog, and what the trainer wants to achieve. Your trainer will let you know what equipment Sabo will need.
Some very high threshold dogs will be worked on a prong to hype them up more.
Some very handler sensitive dogs that have learned that pulling on a leash is bad need to be worked in a harness.
Some dogs will do fine with an agitation collar, or even a fur saver - depends on what specific reaction the trainer is looking to get from the dog.
BH, OB1, TR1, AD
Rottweiler/Hairy Dog mix?? Shelter rescue
Gryffon Vom Wildhaus