I lift my two over fences like this when they can't jump it or go under it, I always make sure to support their tummies with my other arm.
I also pick them up by the scruff and then hold them tightly under my arm when going on the underground escalators as it's impossible to pick them up quickly in any other way when heading towards an escalator at a busy underground station (you get knocked down by all the commuters if you stop at the top or anywhere near the top (or bottom) of the escalators to bend down fully to scoop them up
) My two don't bat an eyelid about this, and I'm always careful to make sure that I support their bodies with my other arm as quickly as possible to take their weight off of my hold on their scruff.
Obviously if they were heavier or a different build of dog then I would not consider (or be physically able) to do this.
I suppose in an ideal world I wouldn't need to pick them up like this, but needs must, and my two are happy for me to do pretty much anything to them, although obviously I'd never do anything I thought was painful to them. They're both happy and healthy and I want them to stay that way!
Mary xxx