Not a Tiger, Please

Good morning, postie, have you got a package just for me?
I sent a letter to my gran who lives across the sea.
I’ve been waiting for her answer, but she hasn’t written yet,
I wrote last week to ask her, please, to send a little pet.

A kitten or a hamster, or perhaps a little mouse,
Anything much larger wouldn’t fit inside our house.
I hope it’s not a tiger, that would make a giant mess,
I’d have to ask to keep it and my mum would NOT say yes!

Tell me, postie, please, because I can’t wait here all day,
I’ll need to buy some pet food and some toys so we can play,
And if it is a tiger, kindly leave it on the mat,
I’ll send it back to granny and request a little cat.