Ask for free samples:
http://www.yorkietalk.com/forums/yor...e-samples.html
I read somewhere that the fish formula for Wellness has a fish bone in it? Is that why you want to switch? The other formulas should be fine.
It is best to feed Yorkies kibble...good for their teeth. Canned food also causes bad breath. I don't know why your vet would recommend canned food. Maybe cause your pup is teething? I would just moisten the kibble w/a little water. Never liked canned food. IMO.