im picking up my 8 wk old bullmastiff next saturday and want to get him used to a car harness when we get home.....(put it on him when playin etc)....does anyone have an idea what size i should get?????  i want to try and get everything b4 he gets home...and thought on the off chance some 1 might know...many thanks

I reckon a medium one will be adjustable enough to fit him now and last him a little while before you have to then buy a large or extra large one.