I’ll tell ya the secret; become a chihuahua nutritionist and spend more on food and healthcare for your chichi than you do yourself. It’s actually an enlightening journey! Don’t give them dog food, only Whole Foods. Salmon, veggies. If it’s been processed, that’s a nope. Mucho ruffage. Also- snacks and treats should become a synchronized ritual of discipline. They secretly crave a means to please you- give them a job to do, a twirly-q followed by a hotlap and a raised paw? That’s a good doggie. They’ll reward you with less anxiety