Originally posted by Fuzzy317
Not sure about fattening or not, but if our Eli (collie/lab mix) is given a fairly large rawhide bone, he developes a bad case of gas.
The same thing happens to my mom's dalmation--whew!!!

Our dogs don't really get rawhide--they cannot have bones, because they may fight, so we just stick to things like Nylabones.
I would imagine, like anything, if the dog eats to much of it, he or she could gain a few pounds.