SEE PAGE 2 FOR PICTURES OF NEW HARNESS! Is this a good harness for dog carting? I am looking into training my 1 1/2 year old 45lbs border collie to pull a cart. The cart would contain small loads of fire wood, ect. (I got the picture off of http://www.amazon.com/NYL-PULLING-HARNESS-32-BLK/dp/B00176BDHU/ref=pd_bxgy_k_img_b ) All and any input is appriciated. Thank you in advance.