My cat has been suffering from dehydration and I think depression. He doesn't eat very much anymore and I rarely see him drink. I've also noticed a significant weight loss. He has also been wetting himself recently after he's been sleeping. I just moved off to college and he's back home with my mom, who takes care of him. He's had problems in the past with chronic diarrhea but that has been resolved with medication (he has Fortiflora with his food every day). He's only about 1&1/2 years old and I'm really worried about him. My mom seems to think he is just depressed. What do you think is the best thing we could do for him?