private void PickUpButton_Click(object sender, RoutedEventArgs e)
        {
            ShelterView shelterView = new ShelterView(s);


            if (s.ContainsName(RemoveNameTextbox.Text) == true)
            {
                s.RemoveByName(RemoveNameTextbox.Text);
                PetsDisplayLabel.Content = shelterView.Show();
            }
            else
            {
                MessageBox.Show("There is no pet by that name.");
            }
        }