Can't sleep

I can't fiance and I care for his dad's dog unfortunately she eats stocks,underwear,ect of the kids things when we aren't looking..well she ended up needing surgery to remove these things from her stomach..well vet kept Her under anesthesia for 24 hours woke her up ans sent her right home 2hra later at 7pm she passed at fiance is devastated so is his family and my heart hurts so bad for them....I feel like I failed at cleaning and she died because I didn't keep up after the kids like i should. kadie sue..