You’ve got more than one cat. You love them all. You’ve got plenty of food bowls, climbing trees, and windowsills to go round. But then it starts.Pee behind the telly. Puddles in the laundry basket. A squirt on the hallway skirting board. Suddenly, your harmonious little feline family has turned into something resembling a cold …

If your cat is peeing where they shouldn’t — behind the sofa, on the rug, under the bed — you’ve likely spent a small fortune on new litter, fancy trays, diffusers, and scratcher toys. You’ve probably threatened to sell the house and start again. But before you do, let me ask one very simple question:Have …