I have a 5 1/2 month puppy who hates going out for walks. I've never had a dog like it, as soon as he spots the lead he runs upstairs & hides in he wardrobe? He hasn't had any bad experiences while out walking, which would explain it. He's really good with other dogs & people not scared of traffic. but now I feel the bad one for taking him out when I know he hates it. He will go out in the garden with no problems. I'm starting to think he's lazy.  Any ideas how to change his mind?