Kelly Richardson Images has an assortment of props, such as the balloons in photos shown in this post, that are photographed and isolated in Photoshop. These prop images can be licensed with the pet images. As you can see ballooons make it much more FUN!
The image right: Yellow Labrador Puppy photographed with yellow party hat isolated on white background, balloons, and balloon curly ties under foot were added to design in separate layers.
You can license these images in “pieces” as individual layers (upon request) and move them around anywhere in the photo to suit your product sizes, whether it be a horizontal or vertical space you are trying to fill up.
Here is another example form the new Pomeranian Puppy Shoot with adorable Pom Puppy photographed with Birthday hat on its head, background color and balloons were added in Photoshop.