I bought two training collars for my dogs.

The priests wore Roman collars around their necks.

He wore hempen collars with his suits.

I saw several horse collars hanging in the stable.

The stable had a collection of horse-collars hanging on the wall.

Many dog trainers use shock collars to train their dogs.

I bought new flea collars for my cats.

I bought two electronic collars for my dogs.

I bought two e-collars for my dogs.

The prisoners were all wearing Newgate collars.