Many parts of Britain are going to experience soaring temperatures this weekend, up in the high 20s. Please be careful with your Cavaliers, especially if they have got a heart murmur. Walk them early or late and ground them for the rest of the day in a cool house. High temperatures put a huge strain on a dog's heart, especially when associated - as happens this weekend - with high air pressure. Both temperature and pressure are coming down on Monday, but this weekend could literally be a killer. Be especially careful if you take your dog(s) out with you in the car, which can get very hot.

Kate, Oliver and Aled