The answer was:

In sweet fields of autumn
The gold leaves are falling
The dogs bark and chase them
Though their masters are calling

The cats sit on windowsills
And take in the warm sunshine
All the horses grow their heavy coats
To prepare for cold wintertime

All the dogs, cats, birds and bunnies
That we all love and treasure
Are so glad for their warm homes, now,
When north wind brings cold weather

Well, no one else has guessed. So I say we give it to Zippycat, who just missed an s on the horses coatS.