Ibrahim Mogra, one of Britain’s leading imams, said the measures were unnecessary: “In Islamic law the dog is not regarded as impure, only its saliva is. Most Islamic schools of law agree on that. If security measures require to send a dog into a house, then it has to be done. I think Acpo needs to consult better and more widely.

“I know in the Muslim community there is a hang-up against dogs, but this is cultural. Also, we know the British like dogs; we Muslims should do our bit to change our attitudes.”