Extra-reinforced, custom-made double-leather training collars from DogSecurity. 5 cm wide with padding. If you’re not using a harness, it’s important to use a wide, sturdy collar that distributes the pressure.
These training collars are strong enough to withstand a dog standing on them. The collar must be secure enough that the dog cannot break free, perhaps at a moment when the helper is not wearing a protective sleeve.
Width: 5 cm
Sizes that have fit:
45 45–49 cm Malinois female
50 50–54 cm Malinois male / German Shepherd female
55 55–59 cm German Shepherd
60 60–64 cm Large breeds
The listed measurement is the neck circumference +/-1 cm, and the collar can be adjusted up to the next size.