Javascript inheritance pattern

I am writing domain objects in Javascript which gets populated with the database fields. Suppose I have two objects dog and cat and I have following constructor function definition:

function Dog(opt_data) {
  var data = opt_data || {};

  this.name  = data['name'];
  this.breed = data['breed'];
}


function Cat(opt_data) {
  var data = opt_data || {};

  this.name = data['name'];
  this.fur  = data['fur'];
}

Now, both of the above objects have craetedAt and updatedAt properties. So, should I create a new class BaseModel which has there properties and let all the objects inherit that or is there any better alternative in javascript for this pattern?