Use the same short format for every single event
A month of useful training data depends on entries that can be compared, so decide the format once and hold it for every visitor and every delivery. Record who came and roughly how many people, where your dog was when the door went, what he did in sequence, how you responded, and how long settling took. Short factual lines written the same way each time let a trainer line up twenty events and see change, while long varied diary entries hide the comparison inside the storytelling.
Describe behaviour, never character labels
Write what a camera would see: barked from the hallway, hackles up for the first minute, took a treat after five minutes, chose to leave the room. Avoid verdict words such as aggressive, dominant or fine, because they tell the trainer your conclusion instead of the evidence, and two owners use those words to mean opposite things. Include body detail that matters at the door, like stiffening, hiding behind you, or pulling towards the visitor, since the sequence from first sound to settled is the pattern the trainer is being paid to read. Note distance too, where you can judge it, because a dog who barks at the gate but settles at the door gives the trainer a different picture from one who escalates as visitors come closer.
Log the quiet events and the context around them
The deliveries where your dog glanced up and went back to sleep are data too, because they show which variables make the difference. Note the context that trainers always ask about and owners always forget: time of day, whether he had been walked, whether the knock was expected, whether the visitor came inside or stayed on the step, and whether it was a familiar face. A reaction that only happens to evening callers, or only when he has missed a walk, is a finding in itself and it only emerges if the dull entries exist beside the dramatic ones.
Write it the same day, and keep the wording honest
Doorway events blur together within days, so complete each entry that evening even if it is only three lines. Resist tidying the record in your dog's favour or making your own handling sound better than it was; a trainer who sees that you stepped in late twice will work on timing, which is useful, while a polished version earns praise and changes nothing. If other family members witness events you miss, have them add entries in the same format and initial them, so the trainer knows whose account each entry is.
Present the month as one readable packet
Before the session, read through the month yourself and add a brief covering note: the three events that worried you most, any improvement you think you saw, and the specific situations you want help with, such as tradespeople entering the house. Send or bring the whole log rather than selected highlights, because trainers spot patterns across ordinary days that owners filter out. Keeping that month of dated reaction entries in your dog's Pet Passport on KinsLe means the full log, his history and his routine travel together as one packet your trainer can study before you arrive.