Well you just have your hands full, lol. The overweight one is not an issue. You can control that by upping exercise and decreasing what you are feeding. I would look into trying Abady granular with the two with colitis-it worked wonderful for my girl, but every dog is different of course. Its also VERY high calorie so your one will gain weight on it-I have used it on several rescues to date and not a single one failed to gain, and no one had stomach issues. I have also had great success with victor Grain free Ultra pro for weight gain and colits/IBD, but it is higher fat 22% so you would need to be careful if you have a fat sensitive dog.
