Personally I would ask the outgoing tenants (face to face) why they are leaving, and mention your concerns over the dogs and your child. If you don't get any alarm bells I wouldn't worry about it.
Like others have said, if you are introduced and feed them you will become accepted, as you are supposed to be there. Also if the dogs are professionally trained the will be very expensive and an investment so the owner is going to look after them, so there aren't likely to be wild rabid beasts that some people on here seem to assume all dogs are.
Most people would consider it an upside of living in the country to have guard dogs around, as it makes your house less of an easy target for opportunists.
I know my girlfriend was glad of our dog when this bloke was spotted hopping over a wall two doors down from our house http://walesandwest.com/convicted-murderer-on-the-run/ and she found 3 Policemen searching our garden and looking in the woods behind the house incase he had decided to hide somewhere, and she was told to lock the doors and stay near a phone incase he came back.
surfer - Member
they only bite who they are told to...
Because they always do that dont they
I wouldn't want my children or family anywhere near. Dog lovers will tell you everything is fine and look for every positive however you should do your own risk assessment. They are potentially highly dangerous given what you have said and for me the risks are too high.
I am sorry your talking shit, if all dogs were that dangerous they would have been made extinct (by us) a long time ago. Just because you have an irrational fear, don't assume your weakness is actually a fact.