I'm assuming your daughter knows how to behave around dogs and that she hasn't 'provoked' the growl and snap from the dog.
If you are only looking after the dog for a short while I'd probably not bother doing anything other than keeping him away from your daughter or at the very least ensure that an adult is present at all times.
I would definitely mention it to the owner on their return as this is not normal and should be addressed.
I don't recommend you try to remedy this yourself - call in the professionals.
