Hello,
The others are so right. You may have to start potty training indoors as mentioned above. It will take a little longer on PT but it will be more effective. You start out by placing your pup into a small room, place the crate in the center of the room. Leave the door open, then place water bowl and food, on one side of crate. The other side place a potty training pad, at least two of them. In front of the crate, leave, a bone, stuffed animal, and a squeaky toy. In its crate leave a towel in it as well. With maybe another stuffed toy and bone.
Babygate the room off, put on some soft music, place a "small" fan outside the babygated room. Now you have meet all your pups needs while you are away. By taking up the space with sleeping area, play area, potty " " and eating area you should have more success.
The music and fan are to make your pup comfortable and cool. It also acts as a muffler as to drown out, noises or just your leaving AND its habitual great regimen for those daytime naps when you are at home. The potty training pad is just for when you are at work, as well as the method of leaving items around the crate.
As soon as you get home, take puppy outside to potty, always put on the leash everytime pup goes out. It reminds pup its potty time not playtime. Always supervise your pup, when its out and about. Its hard to correct puppy for elimating if you can't catch him/her in the act. IF you DO catch pup elimating, walk briskly over to pup without scaring him/her and quickly put on leash and say "outside" repeating this all the way to the door. USE a firm but gentle voice.
Praise puppy for going outside, even if its a drop. Always act like your pup won the lotto. AND reward with a yummy treat "special" (never gets any other time) for elimating outside on potty pad. I would look into purchasing a book on potty training a puppy. Stay PATIENT and CONSISTENT your pup will LEARN in time.
Hope I helped you some.
