Hewan Mental Illnesses

Common Illnesses
Elephant Hewan typically have bulimia and Avian Hewan typically have Anorexia. This cannot be cured. However, it is possible to treat. Anorexia and Bulimia were developed by these hewan for specific reasons. Elephant Hewan were used as tanks in the war, and Avian were used to fly over enemy lines and to drop bombs. They can't do this if they're too heavy to fly, or too light to run stuff over.

Uncommon Illnesses
For the reasons above, Elephant Hewan and Avian Hewan develop things like depression in their later lives, sometimes teenage years, which is very bad. Parakeet Hewan also sometimes have Tourettet's Syndrome. Cats also smoke cat nip. Yes. Cat nip. Its like marijuana to them. It relaxes them. Oh, and marijuana is legal in this universe. Parents can't buy it while pregnant, but it's completely legal. Anyways, yeah, cat nip is very addictive for cats. Its not really something they get drug withdrawals from, but they like smoking it. Waving it in their face is a good way to get attacked. Just give it to them and they relax.

New Illnesses
Hyena Hewan developed a new mental illness called 'laugholepsy'. Its like Narcolepsy, but instead of randomly falling asleep, they laugh at inappropriate and random times, like funerals and court dates.