I'll be honest, I think basically all schools will tout this on their website. There's a lot of lip service paid to "well-being" and things like gym memberships, yoga/meditation classes, mindfulness activities, etc. But I think there's more value placed in less time in the classroom & realistic expectations for amount of work being done on a weekly basis. tOSU's new curriculum had an initial huge jump in material in the first couple of months, but it's evened out to be fairly reasonable since then, and most of the professors have been VERY cognizant of not overloading us. Part of the reason they changed the curriculum was due to overwhelming feedback that having exams every single week was miserable, so we've now moved to a block curriculum where we only have an exam at most every 2 weeks. There are also two full-time counselors on staff that are dedicated to the CVM students, and they have the ability to refer out to a psychiatrist for any issues requiring medications. We even had a multiple-week unit in our communications class on how to deal with interpersonal communication in the workplace and maintaining a work-life balance, and that's going to be continuing through second year. And frankly, any school that's working to reduce it's overall tuition burden for students has an A in my book (tOSU is middling on this).
I think it's most worthwhile to talk to current students - what's your school-life balance like? Do you feel overloaded all the time? What mental health resources are actually available and helpful on campus? The websites can say all they want that they "value" wellness, but do they back it up in practice? For example, I heard that UMN ditched their dedicated counseling service on campus due to budget cuts, but they also allow your pets to come to class & free kenneling is available for students on campus.