Can cats get depressed in a way similar to humans? Most of the research on depression seems quite human focused. Can cats also get depressed in the same way there's depression for humans?
Human depression has been modeled in a variety of animal models, including cats (Wilner, 1984). Cats show comparable signs of distress when subject to maternal separation, including separation phenomena of protest, followed by despair. Although it is hard to project the DSM-V criteria onto cats, they can show comparable behaviors when subject to anxiety and stress. 

Reference
- Wilner, Psychoneuropharmacol (1984); 83(1): 1-16