Jovi's 8 months old and he doesn't like peeing in the rain (so much for having a puppy over the summer months).
I have to go out in the rain with him and make really excited noises. If I feel we're out there too long and nothing is happening. I go back in and wait 5 minutes and try again (obviously don't leave him so if it looks like he's going to go, I can put him out quickly).
I only praise, treat and fuss the outside toileting, and ignore any indoor errors... He's getting there, but we still get the odd wees! I'm sure he'll grow out of it