Intro:
Sort of country strum like this ():
E|------0-------0-------0-------0-------0-------0---------------------------| I
B|------1-------1-------1-------1-------1-------1---------------------------| I
G|------0-------0-------0-------0-------0-------0---------------------| I-----| x2
D|------2-------2-------2-------2-------2-------2---------------------------| I
A|--3---3-------3---3---3-------3---3---3-------3---3-------0---2---3-------| I
E|------3---3---3-------3---3---3-------3---3---3-------3-------------------| I

Chorus:

C                                              C*   G
I was walking down the road and I saw a donkey hee haww
and he only had 3 legs
           C                             G              C
he was a , wonkey donkey, wonkey donkey, wonkey donkeyyyeah

Verses

and he only had 3 legs and 1 eye
he was a winky wonkey donkey, winky wonkey donkey, winky wonky donkey

and he only had 3 legs and 1 eye and he liked to listen to country music, yee ha
he was a honkey tonkey, winky, wonkey donkey,honkey tonkey, winky ,wonkey donkey,

and he only had 3 legs and 1 eye he liked to listen to country music and he was 
quite tall and slim
he was a lanky, honkey tonkey, winky, wonkey donkey,lanky,honkey tonkey, winky, wonkey donkey,

and he only had 3 legs and 1 eye, he liked to listen to country music, he was quite tall
slim and he smelt really, really bad.
he was a stinky dinky, lanky, honkey tonkey, winky, wonkey donkey,stinky
tonkey, winky, wonkey donkey,

and he only had 3 legs and 1 eye, he liked to listen to country music, he was quite tall
slim, he smelt really, bad and that morning he got up early and hadn't had any coffee.
he was a cranky, stinky dinky, lanky, honkey tonkey, winky, wonkey donkey,cranky,stinky
tonkey, winky, wonkey donkey,

and he only had 3 legs and 1 eye, he liked to listen to country music, he was quite tall
slim, he smelt really bad, he got up early in the morning and hadn't had any coffee but
was always getting up to micheif.
he was a hanky panky, cranky, stinky dinky, lanky, honkey tonkey, winky, wonkey
panky,cranky,stinky dinky,lanky,honkey tonkey, winky, wonkey donkey,

and he only had 3 legs and 1 eye, he liked to listen to country music, he was quite tall
slim, he smelt really bad, he got up early in the morning and hadn't had any coffee, he
always getting up to micheif but he was quite good looking
he was a spunky, hanky panky, cranky, stinky dinky, lanky, honkey tonkey, winky, wonkey
panky,cranky,stinky dinky,lanky,honkey tonkey, winky wonkey donkey,

Song structure:
Intro, Chorus, Verse, Chorus Etc., ending with a Chorus, only like this:

C                                              G*   C~
I was walking down the road and I saw a donkey hee haww
and he only had 3 legs