Dogs dont eat food. Stressful abt it.

Hi, I have 2 labs, cross breed. Both female. Same mother. 4yrs old. Now a days they are not eating food regularly. Sometime 1 time in 1 day and sometimes not at all. I give them Pedigree with boil chicken or cooked rice with boil chicken. But they don't eat food at all. If I give them choostick or bone or Drools liver pieces they eat that. Also while having breakfast they eat Marie biscuits with us. Or when my 2 year old daughter give them something whatever she is eating, they eat that.(I can't give my daughter boil chicken and pedigree, so that they will eat). Even they go for walk and very active but when it comes to eat food same old story. Like eat only chicken pieces and leave everything as it is. Please help I am very worried abt it as feel very stressful abt it.