Stubby,
<start newbie who knows nothing>
why can't you cross silver on silver? Surely it is just a colour, dominant or regressive and nothing more?
The lumps on the back sound like Osteodystrophy, did they also have breathing probs and a seal like walk?
<end newbie who knows nothing>
/Mad
you hit the nail on the head, as for breeding silver to silver some say you cant it causes deformitys (sp) but i now lads who have breed them for years with only a couple of deformed kits .