i feed mocha innova small bites (protein content i believe is around 24%). the regular innova triangle shapes seemed to be too big and i found from my pet boutique the small bites formula--it's as small as eukanuba (i used to feed her eukanuba when i was less educated on different foods). she loves it. i sampled her with canidae which she barely touched, so we chose innova. there are days when i mix a little sweet potato or carrot baby food and she gobbles it all up.
if you are looking for samples, try checking out any pet boutique that carries these brands. they have a ton of free samples.