While it's hard to give a definitive answer to how many stars make up a constellation, Canis Major is typically recognized as having 11 main stars that create its recognizable shape.

However, it's important to note:

* Constellations aren't physically connected: Stars in a constellation are just close enough in our sky to form a pattern, but they are actually very far apart in space.

* There are many fainter stars: There are countless stars in the area of Canis Major, but only the brightest ones are included in the constellation.

* Boundaries are arbitrary: The boundaries of constellations are defined by the International Astronomical Union, but these are somewhat subjective.

So, while there are 11 main stars that make up Canis Major's recognizable shape, there are actually many more stars within its boundaries.