The original would be the closest to the picture you have submitted where I try to capture their unique personality and spirit that you see in them, focusing on that aspect with a simple solid background.
Van Gogh / Expressive
The van Gogh style uses heavy type brushstrokes lending itself to short haired pets giving them a more masculine look.
Whimsical & Background
The whimsical style uses light feathery brushstrokes that will only complement long haired pets. In addition to the simple solid backgrounds, I also offer one's that I create and feel will lend itself to enhance your painting or if you prefer it to be more custom detailed as per your request; please understand that will incur an additional charge depending on its complexity.
The Pop Art style is pretty much self-explanatory.