When ill, cats may exhibit nonspecific clinical signs. Often owners are tuned into their cat’s nuances, so subtle behavior changes may be all that can be provided in a history. For example, the cat may be sleeping more than usual, not socializing as much, eating less, or simply hiding. We refer to these cases as “Ain’t doing right,” or ADR. As certain disease conditions are more common in cats over 10 years of age, a list of ADR causes in geriatric cats is different than those found in kittens or younger cats. The conditions discussed here are not all-inclusive, and older cats frequently present with concurrent diseases. Following is the author's view of the top 5 ADR causes in his practice.