Naomi hasn't really shown any signs of SM. She scratched a bit when we first got her, but I think that had more to do with her collar than anything. She hasn't done so in about a month.

Here's my question:

If a dog has SM or CM, even without symptoms, will it show up on the MRI? Or is that the sort of thing you need to wait for symptoms for it to appear?

Aka: Can it be predetected?