Here’s the thing:
At the first glance it appears that there are a lot of things that cause weight gain in dogs, but the reality is that just like with humans it’s all about energy balance. Dogs gain weight simply because their daily caloric intake is greater than their daily caloric output. In simple terms they either eat too much or they don’t move enough.
There’s no dog food that will make your dog lean, but I would recommend you to look into supplements for example: http://bestdogremedies.com/product/w8-off-weight-loss-aid-for-dogs/
