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Originally Posted by Ozzy-LFK  Thank you for your welcome and advices! 
I know that Yorkies can be different sizes, but as my vet pointed out, then Ozzy should not be much heavier than his heaviest parent, but he has reached this weight already in first 4 month which suggests the mixing issue. 
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Ok your vet might need to go back to school. Parents are one factor in determining size but ONLY one of them. The whole family history comes into play going back generations. My Gulliver is 11 pounds, twice what his parents are, and has a litter mate who is only 4 pounds. He's 100% Yorkie, I knew his breeder before he was born and she owns both of his parents. He's just a throwback to the early years of the breed when Yorkies were bigger dogs.