My Pearl has always been a picky eater and sometimes she'd rather play than eat. All of my cats are on a grain free diet. They all eat Innova Evo dry as well as the 95% Duck and 95% Venison Innova Evo canned. They also eat Natural Instinct canned Lamb and Rabbit. They all love the canned food except for Pearl. Sometimes she'll eat a little bit of it but for the most part she'll only eat the dry food. I just let her eat the dry and it's still a good food for her because it's very high in protein and grain free. Maybe you could try Innova Evo or another brand of grain free dry food for Piggy. Good luck.

My cat Ziggy has the nickname "Ziggy The Piggy" but it suits her because she loves to eat and she's a huge cat especially for a female. One question I have is why haven't you spayed your females yet or is Piggy the only one that isn't spayed yet due to her weight? Hopefully all of the males have been neutered or they might start spraying.