Tender chicken & tuna in rich sauce. Hartz Delectables Stew Chicken & Tuna is a delicious combination of tender real chicken & real tuna in a rich sauce for a lickable treat your cat will crave. And, it supports your senior cat's health with vitamin E and B vitamins. Hartz.com. Calorie Content: 350 kcal ME/kg (calculated. Calories Per Pack: 14 kcal ME/40 g. Product of Thailand.