@Beanwood I'll post my notes on Scavenging behaviour here, so anyone can see. These are a really brief summary of the interview - the conference is called KIENO (Kindness is Essential Not Optional)).
Scavenging behaviour in dogs- Simone Mueller
Causes
1. Dopamine release, through searching/ seeking. Endorphin release on finding. Like humans gambling.
2. Genetics - Labradors gene mutation, don't know when full. Hounds, living in a pack, fed by food thrown into pen - evolutionary advantage to grabbing food.
3. Habit - re-homed street dogs
Management
1. Muzzle
2. making sure dog is not very hungry before going for a walk (giving small amount of food before going for walk)
Training
Train dog to indicate when they spot food and then give something even more delicious - lots of repetitions needed.
Need to scaffold behaviour - start with low-value food in familiar environment, build levels of difficulty slowly.
Play scavenging games, to give dog an outlet for this behaviour. So scavenging is put on cue.
It's not necessary or desirable to only feed your dog treats from your hand - not allowing them to take treats from the ground will not prevent scavenging.