Sentry HC Good Behavior Pheromone Dog Collar, 23-Inch

Are the collars in the 3pack individually wrapped? And how easy is it to put on compared to the adaptil brand?

What’s the difference between the green one and the purple one besides the cost?

From the dimensions, this seems pretty small. How long is this collar and what size neck will it fit up to?

Will it fit a full grown labrador?