Vaccination proof is the entry ticket
A training class puts your dog nose to nose with unfamiliar dogs in an enclosed space, so trainers protect the group by asking for vaccination proof before the first session rather than after a problem. Expect to show that core vaccinations are current and, for adult dogs, that rabies vaccination is up to date. Some venues also ask about kennel cough cover, because a class is exactly the close-contact setting where a coughing dog can empty a room for a fortnight. A clear photograph or scan of the vaccination record is accepted by many trainers, but bring the original booklet to the first session in case they want to see it. If your dog's boosters are due soon, tell the trainer the date; turning up with proof that lapses midway through a course creates an avoidable interruption.
The registration form is where honesty pays
Beyond vaccinations, most trainers ask you to complete a registration form, and this is paperwork worth doing carefully rather than in the car park. It usually covers your dog's age, breed, sex, and whether he is neutered, plus how long you have had him and where he came from. The important part is the behaviour section: note honestly if your dog lunges at other dogs, guards food or toys, is frightened of men in hats, or has ever snapped. A trainer who knows that in advance can place you at a sensible distance, choose exercises that set your dog up to succeed, and protect everyone else. Concealing a known problem to get into a class does the opposite, and it often ends with the dog removed from the group he most needed help in.
Health notes the trainer may need on the night
Add anything physical that changes how your dog should be worked. A dog recovering from surgery, a young dog whose joints are still developing, a senior dog who tires quickly, and a dog with a heart condition picked up at a vet check should not all be asked for the same repetitions, jumps, or session length. Note any daily care your vet has asked for, any food used as training treats that he cannot have, and the treats that actually motivate him, because a trainer handing out the wrong food can undo a careful diet. If your dog wears a muzzle comfortably, say so and bring it; many trainers welcome a muzzled dog whose owner is upfront. Emergency contact details and your vet's number complete the set, so that if your dog is hurt or taken ill in class, nobody is searching for basic information.
What to bring on the first night versus send ahead
Send the vaccination proof and completed registration form before the course starts whenever the trainer allows it, so queries surface while there is time to fix them. Bring physical copies anyway on the first night, along with your booking confirmation. Keep the set together in one envelope or folder rather than loose pages in a training bag with treats and a water bottle. After the course, file the trainer's assessment or progress notes with the same paperwork; if you move to a different class or a behaviourist later, that record shows what was taught, which cues your dog knows, and what was still being worked on. Storing that training record alongside his health papers in KinsLe's Pet Passport gives the next trainer his full background in one packet instead of a partial story.