My 6 month old puppy howls when I leave the room, how to stop this.?

I take my puppy to work with me. If I leave the shop to step outside lets say to sweep or help a customer with something to the car I can hear him howling inside. If I take him in the car and have stopped at a friends house to drop off something, I walk to the house door, he can see me but still howls. How can I... show more I take my puppy to work with me. If I leave the shop to step outside lets say to sweep or help a customer with something to the car I can hear him howling inside. If I take him in the car and have stopped at a friends house to drop off something, I walk to the house door, he can see me but still howls. How can I stop this.
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