My dog pulls when you walk him.hes a doberman

You should buy Dogtra 1900S Black Edition 1-Mile Dog Remote Training Collar System, Item #: AGM-1900S-BLACK-EDITION it should stop him from pulling you while walking.

Will these work with the dogtra 200c?

Yes it will work on dogtra 200c.

Do the contact points screw on and fit all collars or do you need different contact points for different collars? We have a 2500T&B series.

Yes it fits all Dogtra models using female contact points, except YS200 and 150NCP.

Will these contact points work in the dogtra 1900s

Yes.

Are they good for in water use

Yes

Will these contact points work when submerged in water?

Yes

Will these fit and work on a 2300NCP?

Yes

Will this work for the Pet IQ collar?

You need to call technical team 888-811-9111.

Will these contact points work on model280c?

Yes, it will work on model 280c.