We have 3 cats. The oldest was 3 when my husband brought the other 2 home. The original one started peeing where he wasn't supposed to and spraying. Had a thorough check-up to see if he was sick. Put up with this for 5 yrs peeing several times a wk where he shouldn't. 1st day I plugged in Feliway Multicat there was improvement. Now he has only peed where he should 3 times in almost 3 months. I am retired so I can keep up with this. I am very pleased with the results. Wish I got it 5 yrs ago.