Can I have more than one Emotional Support Animal?

I currently have a dog who is my ESA. During a time when I was very sluggish from meds more recently, the dog started acting sad and lonely so I got a cat to keep things a little more lively. The cat is also very afrectionate and we're like a little family now. I was wondering if I could have my cat as another ESA? I want to keep my options as open as possible in terms of future living arrangements and I was wondering if an apartment complex would be sketchy about TWO ESAs....