The expression ‘my dog’, according to Frege, is a singular term. It picks out an object (my dog, Zermela). The expression ‘is asleep on the floor’ refers to a concept. Concepts are functions. In this case, the concept is a function from objects to truth values (which are also objects). So, we can treat the above sentence as representing the concept __ is asleep on the floor as applying to the object my dog. 