Petsafe Flex Contacts for Collars, 4-piece

Will these work with the Little Dog Remote Trainer (PDT00-13410)? The included probes are way too small for my tiny spitz.

Are these compatible with SpotOn collars?

Is it compatible with the if-100 petsafe wireless system?

Will this work with the big dog elite model pdt00-13625? The standard ones are causing sores.