There is no dog breed called "Biton Dog." It is possible you may have misheard or misspelled the breed name.
Perhaps you were thinking of:
* Boston Terrier: A small breed, typically weighing 12 to 25 pounds.
* Bichon Frise: A small breed, typically weighing 10 to 18 pounds.
* Brittany: A medium-sized breed, typically weighing 30 to 40 pounds.
Once you provide the correct breed name, I can tell you about its size.