South of the Central Belt of Scotland is fine for deliveries, especially if you found somewhere near the M74. It's also within striking distance of some of the most beautiful countryside there is.
Ditto! I'm in South Lanarkshire, Lesmahagow to be exact. 10 minutes from the M74 motorway, less than an hour to Glasgow or Edinburgh but in splendid isolation in beautiful countryside. Downside is that it's cooler and your growing season is slightly shorter than down south - but adapt your planting and acquire a polytunnel and it's totally do-able

We had loads of foxes when we had our pigs and they never caused a problem for our chickens or turkeys - the smell of pig poo is supposed to keep them away, I can't say for certain that it works all the time but it seemed to for us.
Farm dog versus pet dog is a tricky situation IMHO. Farm or working dogs are a very different beast to a loving family pet as others have already said. That's not to say working dogs aren't loving or friendly.
Get a dog you like, aim for it to be a pet and if you get it as a pup and socialise it with all your livestock, giving firm training as you go and it should respect them as it grows

The cleverer the dog, the quicker you'll train it.
We have two German Shepherds - great big barky scary guard dogs. Except they're not (well, they DO bark, a lot) but they are great family pets, will walk for miles or lay at your feet in front of the fire. Clever and easy to train and great big loveable lumps. Everyone has their favourites

Good luck with your search - pet and property.
HH