How many legs do cow have?

While walking home after school, and Andrew and Mathew saw a herd of cows. “Andrew, how many legs do a cow has?”, Mathew asked. “Well, obviously FOUR!”, Andrew answered.

“If two?” Mathew asked.

“If two, then it’s a disabled or flawed cow.”, said Andrew.

“False, if the cows two, then the legs should be eight, FOOL !!”