Question

is this a action verb or linking verb Dogs are very good smellers

Answer 1

It's an action verb.

Answer 2

No!

Action verbs tell what the subject is DOING.
Linking verbs don't.

www.chompchomp.com/terms/verb.htm

Answer 3

I think "grammer" meant dogs are very good spellers ...

Answer 4

So are you saying that's a typo?