These are vintage and very rare. 

I bought these years ago because I was going to use the bulldog and the poodle to make jewelry with and never did. Lot of 6. 

There is a poodle, a bulldog, a dalmation, a golden retriever, a collie and a scottie.

They have 2 posts or brads on the back.

Possibilities for these are vast! 

Impossible to find.