Minimum health clearances recommended by ACA for breeders include:
OFA rating of Excellent, Good or Fair on hips to rule out hip dysplasia
OFA rating of Normal on thyroid to rule out autoimmune thyroiditis
OFA of Normal on eyes to rule out numerous inheritable eye conditions.
Optional, but recommended include:
OFA rating of Normal on elbows to rule out elbow dysplasia
OFA rating (veterinary exam) of Normal on patella to rule out patellar luxation