Blood panel with CBC is "required" for all dogs over 6. It really should be done at least yearly (some say twice yearly) for dogs of any age though.
Heartworm test.
You can do a bile acids test. Not necessarily recommended, but an extremely good idea to do in Yorkies just to look. That would probably only need to be done once.
Fecal.
I also like to do a urinalysis, but I like to be careful...
While not at all routine, you can do an EKG if you want to.
Some people also do vaccine titers.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |