Field Notes · An evolving learning library from Angier K9

Cases · Case

Chapo

Who Chapo is

As the trainers describe him

Very big and heavy-set.
On film

está muy grande muy grande

Watch at 33:11 ↗

se ve bien grande y grueso

Watch at 33:19 ↗
'Truly aggressive' by the trainer's own contrast with Sofia. He wears protective clothing with such dogs. This is his characterisation, three days in; no incident is described.
On film

Porque tengo uno que está muy agresivo de verdad. El Chapo.

Watch at 32:59 ↗
At pick-up he is intensely fixated on the staff, but improving as it goes.
On film

He's just so fixated on us.

Watch at 20:05 ↗

He's doing better. He's not going right into the bike.

Watch at 20:09 ↗

The program, stage by stage

Pick-up

2026-09-14.

Two staff collect him from a gated enclosure. A leash is made into a slip lead, and the line is handed across the gate. A ball and tug toy are fetched from the truck so the first contact is play. He is asked to sit, is intensely fixated on them, improves, and is loaded with 'Go home' while both handlers keep even tension on the line. In the debrief they agree the tug was the right call because it said they were there to play, not to confront. They expect him to play ball and tug. A stretch of client scheduling by phone (04:10-07:24) is private and not used.

On film

Felton, do you want me to make this into a slip lead?

Watch at 3:07 ↗

You're going to see there's a ball and there's a tuck toy.

Watch at 14:11 ↗

Go home, Chapo! All right. You're just gonna keep even pressure.

Watch at 21:01 ↗

well it was good that we ended up doing it that way because he actually he did good coming out

Watch at 22:16 ↗

yeah yeah he was doing good and especially with like the i think it was a good call on the tug

Watch at 22:22 ↗

How the method adapted

One handling choice at pick-up, explained afterwards.

The first meeting was framed as play: a tug and a ball rather than a straight leash-and-load.

Stated in the debrief: they are not there to confront him, they want to play.

On film

yeah because then it's like hey like dude we're just here we're not here to like attack anybody that's just anything yeah like honestly i just want to play

Watch at 22:27 ↗

like because I mean that's true yeah I have no interest in having confrontations with dogs no I do have a lot of interest in playing with dogs

Watch at 22:36 ↗

Two-person handling: a gate hand-off, then even tension from both sides while loading.

Not stated. Inferred: safety with a large dog reported to have bitten.

On film

Keep even tension.

Watch at 21:12 ↗

What the family was told

In the family's own words

None.

Outcomes

What the trainers reported

He did well coming out.

Staff debrief at pick-up

On film

well it was good that we ended up doing it that way because he actually he did good coming out

Watch at 22:16 ↗

What the footage shows

A calm pick-up and loading, with no incident audible.

How it ended. Chapo is still in training.

The ideas Chapo's case runs on