Invisible fence for dog

[Not-so Slick Chicken]

Pepper gel? Have to look that up.
I talked to a police officer about the gun that shoots pepper pellets that explode on contact, he said very bad idea! It's a one shot at a time, reloading after every shot. Terrible idea!
Mary

It's pepper spray, but gel instead. Less risk of blowback, or so it claims.
I haven't tested any
All the dog-specific ones (less capsaicin) are spray only.