swift for loop not looping enough times - ios

Question

I have a tableView in my app, and when i load the app I want the view to be populated with a list of dogs (retrieved from a server).
I have this working, but it will only load the first dog in the list from the server.
here's the code starting from where it serialises the JSON response from the server
do {
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments) as! [AnyObject]
dispatch_async(dispatch_get_main_queue(), {
self.tableView.beginUpdates()
if let theDogs = json[0] as? [[String: AnyObject]] {
for dog in theDogs {
print("Dog")
if let ID = dog["ID"] as? String {
print(ID + " Safe")
let thisDog = Dog(name: (dog["Name"] as? String)!, surname: (dog["Surname"] as? String)!, id: (dog["ID"] as? String)!, boarding: true)
let newIndexPath = NSIndexPath(forRow: self.dogs.count, inSection: 0)
// code here
self.dogs.append(thisDog)
self.tableView.insertRowsAtIndexPaths([newIndexPath], withRowAnimation: .Bottom)
}
}
}
self.tableView.endUpdates()
})
} catch {
print("error serializing JSON: \(error)")
}
here's a copy of the logs (which includes a printed response from the server)
Optional([[{"ID":"47","Name":"Sparky","Surname":"McAllister"}],
[{"ID":"31","Name":"Maddie","Surname":"Crawford"}]])
Dog
47 Safe
as you can see from the log, there are 2 dogs on this list.
I would expect to see Dog printed twice in the log if the loop was working and 31 Safe if it was getting to the part of the code that creates a new Dog object.
I can't work out what i've done wrong, can anyone see my problem?
thanks

Answer 1

Because the JSON is an Array of Arrays containing one dictionary each when you call if let theDogs = json[0] you get this part of the JSON: [{"ID":"47","Name":"Sparky","Surname":"McAllister"}]
You would need to call if let theDogs = json[1] to get this part of the JSON:
[{"ID":"31","Name":"Maddie","Surname":"Crawford"}]

Answer 2

Ok, thanks to Travis' answer I was able to see where i'm going wrong. I just made a little tweak to his suggestion so i'm posting as an answer.
as Travis said, I need too access json[1] but i could have 7 different dogs on that list!
so i made the following changes:
if let theDogs = json[0] as? [[String: AnyObject]] {
is now:
if let theDogs = json as? [[AnyObject]] {
which means in the for loop i'm accessing the root array.
I then changed the for loop from:
for dog in theDogs{
to:
for aDog in theDogs{
let dog = aDog[0]
which means for every array in theDogs, i'll get the only object in the array and call it dog.
problem solved, and future proofed.
thanks to everyone that helped!