Since there are some pretty good-sized dogs out there I thought it would be good to have a handy set of scales to carry. I picked up this set for right around $10 shipped to the house. It is extremely light and compact. The other good thing about it is that it also has a thermometer. The only drawback is that it reads in Celsius. But you can do the conversion when you get home.
This scales goes up to 88 lbs. and has a tare and lock so that even if your yote is swinging around the scale will not lock until it has a steady number. Beats trying to guess what the weight is and since it weighs literally ounces you hardly know it's there. You can get this one on Amazon.com. Just copy this title and it should come up.
40Kg 28g Digital Hanging Luggage Fishing Weight Scale
(http://i867.photobucket.com/albums/ab239/Tmroper/scale1.jpg)