What breed is my puppy? Please help!

Whenever I adopted my little Dipper 3 months ago I was told by Humane Society that he was more than likely a Beagle/Jack Russel  Mix. Ever since then he grew bigger and bigger and now (by the age of 5 months) people start asking me if he is a Pitbull mix. He surely doesn't look like a Jack Russel/Beagle. The photos that came closest were of Pitbull/Boxer Mixes but Dipper also has a longer nose that most. I'm very confused!!!I would like to know his breed so I can properly raise him and make sure he becomes a well behaved and happy dog!

Thanks for your help!

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