Squirrel or dog?

I remember taking my youngest to the park one day and while we were there a squirrel appeared. Now at that stage she had only seen cats, dogs, cows and horses and you could practically hear the wheels grinding away in her brain. Which one is it?
Eventually she came to a decision and, much to the delight of all around, she pointed at the squirrel and shouted, "Doggie!"
The squirrel was not impressed.