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Dogs are social animals and so do not cope very well being left on their own. Puppies need to be extensively socialised with as many people, dogs and environmental stimuli as possible. How can you justify getting a puppy and working full time? This is not in the best interest of the puppy! Try getting a dog from a good rescue organisation; if you work full time they will refuse you! A good breeder would not rehome a puppy to someone that worked full time either.
Wait until you are able to look after a puppy properly before buying one. Please put his needs before you own wants.