I’ve looked at this topic this a few times through the years. While building this website, I decided this might be a good place to put a link, for homes that have both cats and depressed teenagers. 

The article lists 11 ways that cats can trigger depression, from contaminated fecal matter to infectious scratches, 

and more. 

The article has a bit of edgy language we wouldn’t want to hear regularly, but has a perspective worth a parent's consideration.

https://www.popsci.com/article/science/11-reasons-why-cat-bites-may-be-linked-depression/