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					Originally Posted by Ellie May  I think four months to a year is most common.  There was atleast one dog diagnosed at age 8 and MVD is sometimes asymptomatic so it can be diagnosed commonly after age 5 or 6. 
You might be interested in this: http://clubs.akc.org/astc/health/astchlth/astcshnt/ | 
 
  Thanks.  When I buy my next puppy she'll most likely be spayed between 4 and 6 months (depending on her size) so i'm wondering if it would be best to do a bile acid test at that point?  Most puppies leave around 12 weeks so would it be almost pointless to test at 12 weeks if most don't show signs until they are older?  And would it be "overkill" to test only 1-3 months apart? 
    
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 ~Magnifique Yorkies~
 Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.