Just as an aside to this - and it may be of interest. During the drought I used to take my sheep all 1000 head of them more or less out on to the road for 3 to 4 hours every 3rd day. It allowed them to get a bit of feed when our paddocks were down to dust and rock, and also kept the road side grass down which also eliminated the fire risk from idiots throwing cigarette buts out of car windows. I had a stretch of road where I could block them from getting past me. Put out signs saying - Caution sheep on road - please slow down and used an area about 1 mile long between our road grid and the start of the neighbours paddocks. The roadside area was quite deep so there was a fair bit of good pick there and a creek crossed the road. All in all a good spot.
They would follow the car out just by me rattling the corn tin loudly outside the window and calling the leaders names out (this is where giving your sheep names comes in handy) - which they all recognized and a repeat performance to get them home with just one dog to chase up the stragglers. I could always rely on Hitler, Girlie, Bones, Hornless and Harley to get them moving.
Then for reasons best known to themselves - quoting a menace to traffic as the reason - the local council decided that one needed a permit to do this and they would charge an amount from memory of around 70 cents per animal a week to let you do this. Here we were 6 years into a drought, hand feeding, wool prices down, and now a bill of this magnitude. Was not going to happen ... so unfortunately careless people sometimes left paddock gates open and one had no recourse other than to load the dogs into the car and go and get them once one realized the little B's had escaped - again and must have been gone for a couple of hours at least

. The road was so busy. Postman Pat came 3 days a week and if you saw one car a day go down the road - ' today busy day' my Korean WWOOFers would comment.
The idiocy of this which I am trying to point out - was that the council was quite willing to rent out to you for the sum of $150 a day their spray rig, complete with herbicide, so that you could spray the roadside verges along the front of your property and other areas of noxious weeds, thus eliminating risk of bushfire and weed infestation, and indeed had sent a circular out to all property owners advising us of their magnanimous gesture of supplying the herbicide at cost price.
Our sheep hungry as they were did an admirable job all on their own with no poisons involved. The down side was a lot of VM in their wool, mainly dreaded cobblers pegs but as the alternative was sheep dead from starvation it seemed a fair price to pay at the time.