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I absolutely adore this band, only just got into them a few days ago and 
been listened to the album constantly :). The song isn't exactly what you'd
call "Guitar-friendly," so try not to be too disappointed if it doesn't 
sound a lot like the original.

(standard tuning-EADGBe)

Intro

         (G maj.)                              (A min.)
e|--7------7------7------7----|     e|--8------8------8------8-----|    
B|--8------8------8------8----|     B|--10-----10-----10-----10----|    
G|--7------7------7------7----| X5  G|--9------9------9------9-----| X1 
D|-----5------5------5------5-|     D|-----7------7------7------7--|    
A|----------------------------|     A|-----------------------------|    
E|----------------------------|     E|-----------------------------|    

          (E min.)
e|--3------3------3------3-----|
B|--5------5------5------5-----|
G|--4------4------4------4-----| x2
D|-----2------2------2------2--|
A|-----------------------------|
E|-----------------------------|

played once without vocals, then:

G (320003@1)                                     AmEm
  Happiness hit her like a train on a track...
G (320003@1)                                           AmEm
  Coming towards her, stuck still no turning back...
G (320003@1) She hid around corners and she hid under beds
G (320003@1)                     Am (x02210@1)     Em (022000@1) She killed it with kisses and from it she fled
     GWith (320003@1)every bubble she sank with her drink
      G (320003@1)       Am (x02210@1)        EmAnd (022000@1)washed it away down the kitchen sink

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From here I would use open chords or preferably barre chords

 G (320033 or 320003) or (355433 barre chord)
Am (-02210)           or (577555 barre chord)
Em (022000)

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    GThe (320003@1)dog days are over
    GThe (320003@1)dog days are done
    G (320003@1)        AmThe (x02210@1)horses are coming
   EmSo (022000@1)you better run

    GRun (320003@1)fast for your mother, run fast for your father
GRun (320003@1)for your children, for your sisters and brothers
G (320003@1)                           AmLeave (x02210@1)all your loving, your loving behind
         EmYou (022000@1)cant carry it with you if you want to survive


    GThe (320003@1)dog days are over
    GThe (320003@1)dog days are done
G (320003@1)                 AmCan (x02210@1)you hear the horses?
       Em (022000@1)            G'Cause (320003@1)here they come 

(silence)

(quiet)
    GG            G (320003@1)      Am (x02210@1)    EmAnd (022000@1)I never wanted anything from you
       G (320003@1)      G (320003@1)           G (320003@1)           Am (x02210@1)       EmExcept (022000@1)everything you had and what was left after that too, oh

(loud again)
G (320003@1)              G (320003@1)                   G (320003@1)AmEm
Happiness hit her like a bullet in the head.....
G (320003@1)                        G (320003@1)             G (320003@1)            Am (x02210@1)      Em (022000@1)Struck from a great height by someone who should know better than that

    GThe (320003@1)dog days are over
    GThe (320003@1)dog days are done
G (320003@1)                 AmCan (x02210@1)you hear the horses?
       Em (022000@1)           G'Cause (320003@1)here they come

(Percussion interlude)

    GRun (320003@1)fast for your mother, run fast for your father
GRun (320003@1)for your children, for your sisters and brothers
G (320003@1)                         AmLeave (x02210@1)all your loving, your loving behind
         EmYou (022000@1)cant carry it with you if you want to survive

    GThe (320003@1)dog days are over
    GThe (320003@1)dog days are done
G (320003@1)                 AmCan (x02210@1)you hear the horses?
       Em'Cause (022000@1)here they come

    GThe (320003@1)dog days are over
    GThe (320003@1)dog days are done
G (320003@1)              AmThe (x02210@1)horses are coming
   EmSo (022000@1)you better run 

G (320003@1)--------------------------------------------------------------------------------
That last bit was a little sketchy, went a bit hectic D=. Anyway that's it, feel 
free to comment and rate :-)

yours truely,
-Gag-Bob