You'll never really know until he's done a Wisdom Panel® test because even your best guess is still just a guess.
Fido’s family tree is a puzzle neither you nor your vet can solve without help. A Canine DNA Test is the only way to know for sure what breeds are in your mixed-breed dog. In fact studies have shown that visual identification, even by professionals, is only accurate about 25% of the time. Have some fun and play the game then get the test and know for sure!