Stacy, I rarely recommend protein drinks but rather suggest individuals consume calories and protein from low FODMAP whole foods - nuts, seeds, tofu, lactose free
milk, chicken, beef, nut butters, lactose free yogurt,
small amounts Greek yogurt such as 1/2 cup — most individuals can tolerate 4 grams
of lactose
per sitting (Chobani is 95 % lactose free with about 4 - 5 grams
of lactose
per 6 oz and LOTS
of protein), quinoa.
Other foods that could help with constipation are
small amounts of milk (1/2 cup, only when your cat is constipated) or plain canned pumpkin (1 teaspoon, 2x
per day).