9: The Norwegian lives in the first house

14: The Norwegian lives next to the blue house

8: The man living in the house right in the centre drinks milk

4: The green house is on the left of the white house (they are also next door to each other)
5: The green house owner drinks coffee

(Note - Since House 2 we already know is blue, and the green and white house are next to each other, they must be 3 and 4 OR 4 and 5. However the owner of House 3 drinks milk. So 4 must be the Green House and 5 must be the White House)

1: The Briton lives in a red house.

7: The owner of the yellow house smokes Dunhill

11: The man who keeps horses lives next to the man who smokes Dunhill

3: The Dane drinks tea
12: The owner who smokes Blue Master drinks beer
15: The man who smokes Blend has a neighbor who drinks water

(OK - here is where we get all the drinks sorted out. The Dane could be 2 or 5. The person who smokes Blue Master could also be 2 or 5. However the Dane can't be 5, otherwise House 2 would be the Blue Master smoker and beer drinker, which would only leave House 1 for the water drinking neighbour; this doesn't work, since this would now make House 2 the Blend smoker. So the Dane is in House 2, etc)

13: The German smokes Prince

2: The Swede keeps dogs as pets

6: The person who smokes Pall Mall rears birds

10: The man who smokes Blend lives next to the one who keeps cats

Which only leaves one gap.

Who keeps Fish? The German.