Training a Dog to Use Pee Pads?

I have had a Pomeranian for 3 months now. The vet said he's about 2-5 years old. We take him out for walks 3 times a day for about 30 minutes each. He usually does his business outside and normally can hold it through the night with no problem.

Once in awhile he would pee a big puddle in the middle of the night or day inside the apartment. I would say in the 3 months we have had him he has peed about 10x inside the apartment. We have pee pads in the apartment, but he never uses them and pees somewhere else in the apartment.

If I teach my dog to use the pee pad by bringing the dog to the pee pad when he wakes and wait for him to pee there. In the future would he not pee outside and just pee inside all the time? I prefer the dog to pee outside, but would also like to teach him use the pee pad inside the apartment in case he needs to go, or when it's cold or rainy outside. Any suggestions?

By terapanda