Wow five pounds overweight it's too much for a small dog so you have to try go out with it and plat at least 30 minutes per day, about london i have to say i don't know london i'm from colobia and london it's to far from here but i would like traveling to europe at least one time in my life :). Regards
Yeah, 5lbs is a lot for a 23lb dog. He's taking off the extra weight pretty quickly though.