Hazel C Carney, Tammy P Sadek, Terry M Curtis, Vicky Halls, Sarah Heath, Pippa Hutchison, Kari Mundschenk and Jodi L Westropp J Feline Med Surg 2014; 16: 579-598 Readers should note that the version of the guidelines that appeared in print in July 2014 and online until May 2018 has been amended. The version now appearing online is the correct one. For information, the following amendments have been made to the original published version. 1) Reference 35 has been updated to 'Guy NC, Hopson M and Vandestichel R. Litter box size preference in domestic cats (Felis catus). J Vet Behav 2014; 9: 78-82.' 2) On page 585, in the 'Litter box size' section, the minimum size dimensions have been updated to '34 × 15 inches (86 × 39 cm)' and the fourth sentence therefore amended to 'We recommend a rectangular litter box that is 1.5 times the length of the cat from nose to base of tail; in one study, adult cats preferred a box that was 34 × 15 inches (86 × 39 cm) over a smaller one.35'.