I did yearly bloodwork on my ferrets once they hit about four. But the dogs...no, not really.
Chloe had bloodwork when she was around two or so, simply because of her aggression issues. Wanted to make sure everything internally (besides her brain
) was fine.
Gracie had a T4 done to see if her thyroid function was related to her allergies and we will have to do an NSAID panel every 6-12 months to make sure the low dose steroid she's on doesn't start affecting her liver.
I think I had bloodwork sent out on Cooper when he was neutered, because I was able to get it done for free.
But yearly...nah. I do it when I suspect a problem and I'd probably even do it when the dogs start to hit "senior" status. But if they are otherwise happy and healthy, I'd rather spend that money elsewhere.