Citronella anti-bark collar--PetSafe and others - Page 1

Does this often work for the GSD?

I see only the PetSafe brand so far, is it good? How durable is this type and brand?

How long does the battery last? How many cans of citronella refill should one have on hand (how long does each tend to last? How often does one have to refill at the collar typically? 

Thanks

Those look like questions to be directed to the manufacturer.
However, I would never use citronella around my dog's face.

ditto,nothing around the eyes.

if it doesn't work, at least it will smell good around your dog.

find a trainer and learn how to teach your dog not to bark without cause.