It is a children's song about animals for sale at a pet shop, a store where you can buy pets. You can see the pets on display in the window of the store.

Hello! Ruth is absolutely right - it is about a pet shop that has a puppy for sale. The singer sings "how much is that doggy in the window" - doggy being a cute word to use for a cute little dog (probably a puppy as petshops rarely sell fully grown dogs). She would like to buy the puppy for her "sweetheart". I hope that helps!

"How much" is a helpful phrase in english an can be applied in a few ways. Common Question: How much is this pair of shoes? Common answer: They are 50.00 dollars plus tax. Common Question: How much have you eaten today? Common answer: All I had was a bowl of soup. Common question: How much television do you usually watch? Common answer: Not much, I only check the news sometimes. So "how much" has a lot of uses and you may see it often in different forms of context.

The question is asking the price of the doggy/cat/monkey.

I have only heard the song with "Doggy" in it. I think the phrase is meant to be cheerful. It would make a child happy to have a new pet. If you can buy things on display in a shop window this would imply that you have plenty of money. I hope this helps.