Liver shunts that are common in yorkies are inherited...So they have them from the time they are born, and you may not see symptoms until they are months or maybe even 1 or 2 old or they may not show symptoms at all. Many people have found out their yorkies have liver shunts/mvd simply through a pre-op bloodwork for a teeth cleaning or spay/neuter.
There are also acquired shunts which develop later in life...
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