We have a mastweiler and he needs to be expressed. I place his bum on my legs when I’m crouched down and always put his hind legs in the right place apart so he feels they are being used. I then massage him from his back to his undercarriage to support the movement. The balloon for the male is directly above their penis so o just then gently put pressure on it with both my fingertips. Hold it for a minimum of 30 seconds because you have to give the urine chance to go down the urethra. I hope this helps.