这么多年我关心的只是只狗
[zhè me duō nián wŏ guān xīn de zhĭ shì zhĭ gŏu]
This conveys deep disappointment in interpersonal relationships. It metaphorically indicates the feeling that the effort or care one gave over many years went unrecognized or was given to someone who did not deserve it as much as even a pet dog would have. This highlights the sense of having been taken for granted.