Impossible, while I was on a vacation I met about 3 people with 1 year+ German shepherds and while i was there Vicky had her ears down and they all told me to give her that syrup as they did the same to there dogs at the age of 2 months as they say and i had to make sure of that from my vet and he said of course it will help her and there will be no harm at all, no side effects.
What i mean is i met 3 dogs that are 1 year old and more and they used the same syrup and never had there ears down after
But as a tip don't use it before your puppy is 2 months old else the results might be as kr16 said, but it works perfectly with all the people i met.
RIP , Lexy 18/2/2014-1/5/2014 (parvo victim)
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11/4/2014 (how to live without her?)