Solving his wet poo issues

So today he woke up as usual with my son.  I tried to take him outside and it's cold so we tried to get him to poo in one of the dog litter box and he did and still wet.  So this morning he ate his pre made kibbles.  On his 2nd meal I cooked him boiled chicken, white rice and diggin' firm up pumpkin.  I cut 1 chicken breast in half then i boiled it high then med for 15mins.  I cut or shredded them into little pieces.  The rice was from the fridge so i put like a 2 tsp of water then microwave for 20sec.  He is picky he doesn't like cold food.  Hopefully tomorrow his poop will firm up.