Miranda Lambert feels “heartbroken” after two of her pets passed away. The 40-year-old singer has taken to Instagram to reveal that two of her rescue dogs, Delta Dawn and Louise, both died recently. Alongside some throwback photos of her dogs, Miranda wrote on Instagram: “In the last 6 weeks two of the best and most loyal friends I have ever had have left this earth “I’m so heartbroken to have lost them, to love this big you have to hurt just as big, they are worth it. (sic)” Miranda recalled that Delta Dawn was “homeless and hungry” when she first saw her. The award-winning star added: “Littl…