Could it be the water?

I have 5 different breed dogs, Ones a 4yr old corgi doxi chi mix, the other a 3yr old purebred pekigese. They both came down with bladder stones a month apart. First the corgi x, then the peek. Now my question is could they have gotten them from the water that they drink? It is well water. The stones that they have are Not the stones that are crystles and can be broke up. The only way to get rid of them is through surgery.  If its the water are they all @ risk? My vet cannot say...................

[Margot49]

Personally, I really have no idea, however, I remember hearing a conversation years ago and someone said their well water was causing stones in their cats.  Something about too many minerals in the water. I guess maybe you could/should have your well water tested then take it up with your Vet?  I think I'd get on the Internet and do some research on the cause of bladder stones.  
Gosh, good luck. I'm not much help with this one.