My cat was diagnosed with megacolon a few months ago. He had sever constipation and I took him to the vet and he prescribed a laxative that finally got him within a couple days. I used to have him on a dry and wet food diet. I have since switched to a strict wet food diet. I also tried to encourage more water intake by increasing the number of water dishes in different areas of the house plus I got a cat fountain. I haven't seen him physically drink. I think he does drink some since the water in one dish seems to go down. He has no issues with urination and seems hydrated. I have been feeding him Nature's Valley Instinct. I noticed recently it seemed like it had changed. It went from looking like ground up meat with peas to more gelatin like. I noticed the can says it's from Thailand and not the US like it used to. It seems they changed the formula. My cat still likes it but he isn't a picky eater. He eats anything you set in front of him. I'm wondering if I should change up the food, and if so what should I go with for megacolon? My cat is large, he weighs 17 pounds. Vet estimates he should weigh around 14 pounds. He's estimated to be 9-10 years old. He's a large breed cat, looks to be Maine Coon or Norwegian Forest Cat. I was looking at Weruva as their food had a high moisture content. It is also made in Thailand like his current food. Not sure if I should just stick with what's working or try something new.