There’s a reason he’s calling it a hot mess, it’s because she wrote about wanting a cat, and since Nate has Ailurophobia ( fear of cats ), and the fact that Nate’s a dog person. Now this is my basing, but the message here is that Nate is trying to make Lily consider getting a dog, and not a cat, so in turn, will make Nate satisfied. but we all know, mostly anything will not go in favor of Nate’s way.
Sometimes, I wish that Nate was bowling, cuz y’know, on Turkey Day, he could get a Turkey. (that’s 3 strikes in a row for your information)