I joined this group in 2003 when I was adopted by a "wheatable". Had no idea what to do with a terrier since I had only had my very calm golden since 2001.
This group was invaluable with all the information they share and it is linked to a wheaten rescue in the states. There is a vet with 30 yrs experience on the mailing list that specializes in wheatens who will share all kinds of information too. I would suggest you lurking around there for a bit and see what others have to say before you get either a wheaten or "wheatable" (their term for a mixed breed! lol)
Good luck and keep us posted.