Not all variants of Takis will contain dairy, but you should be aware that some flavors of these beloved chips will contain dairy. The reasoning behind this is that some of the different flavorings contain various dairy products, which makes them unsuitable for those that cannot have dairy. This is why you should always check the packaging if you are unsure if the flavor in question contains dairy.
However, as a general rule, if you cannot have dairy you should avoid the crunchy fajitas, guacamole, and xplosion flavors of Takis, as these all contain dairy in different forms. All of these flavors of Takis contain milk, and the xplosion flavor contains both milk and cheese. If you fancy yourself a bag of Takis, you should always check the ingredients list on the back of the packet to check that they are safe for you to eat.