How can a packet of meat and veg sit on shelf (no refrigeration) for weeks without going off be free from preservatives??I don't cook for mine - instead I feed her nature diet mixed with harringtons biscuits. All free from preservatives etc etc. Seems to last well and doesn't cost too much and she's happy on it! Took her to the vet for her booster and the vet said she was doing really well so hopefully it'll keep working out