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NATION Norway Denmark Britain Germany Sweden
COLOR yellow blue red green white
DRINK water tea milk coffee beer
CIGAR Dunhill Blend Pall Mall Prince Blue Master
PET cats horses birds   dogs

Clue 10 says we need the person who smokes Blend next to the one who keeps cats, and clue 15 says he also lives next to the person who drinks water (not necessarily the same one who keeps cats). We need one of the pieces:

water         water   water         water
  Blend or   Blend   or   Blend   or Blend  
cats     cats           cats     cats
in the last three rows of the table. Only the set of cells on the left offers a possibility.