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					Originally Posted by Ellie May  What did the vet give, Heartgard? 
The new recommendation is something like three or four months. 
It should be fine, but no guarantees for any dog.   
A lot of Yorkies do quite well on Interceptor.  That would be my choice. | 
 
  Actually, you can't give Interceptor yet, so if your vet wants you to start now, Heartgard would be an okay option.