And then...he died

A bought a fish on Monday
I always kept him inside
But by wednesday he had gotten really ill
and then... he died

So on Thursday I bought a hamster
but he got really wide
So by Saturday he was really fat
and then...he died

On Sunday I bought a Dog
he normally slept outside
I think he ran away one night
so i guess then...he died

On Tuesday I bought a horse
I named him Clyde
But I think someone stole him
and in my heart...he died