Task: Question Answering
Input (English): Context: Saturday evening , our large dog ( part great pry , part white golden retriever ) , Rain , was trying to jump over the backyard fence . The last time she did this ( successfully too , she got nice and lost in the neighborhood ) was when we first got her , before she realized this was her home . After I banged on the window and she briefly hid behind the compost , I went outside to figure out what was freaking her out . What had her shivering with a need to flee ? A real life , fire breathing , wait for it ... hot air balloon slowly gliding over our backyard !. 
Question: What may have caused Rain , your dog , to hide behind the compost ?
Output (English): There was an object unknown to her flying above her .