Jonart Extension Pen - Rail Sides

Give Your Puppies Room to Play, Train and Grow

Your litter has outgrown the whelping box, but they are not ready for the run of the house. The Jonart Extension Pen - Rail Sides is the whelping box extension pen built for exactly that stage. This rail-sided puppy play pen extension attaches to your Jonart Whelping Box - With Floor and adds a full second enclosure of additional space for play, training and growth, so growing puppies get a safe puppy play area of their own while your dam gets her nursery back. As Lakeside puts it, this is an extension pen with rail sides to add additional space for play, training and growth — and breeders who whelp in a Jonart know there is no substitute for a pen that fits the box perfectly, panel for panel, bolt for bolt. If you have been searching for a Jonart extension pen, a weaning pen for puppies or a breeder puppy pen that works as a true system instead of a workaround, this is it.

Three Rail-Side Panels — and No Floor Panels, By Design

The Jonart Extension Pen - Rail Sides is made up of 3 additional panels: (2) side panels and (1) front panel. Extension pens have NO floor panels — the pen extends the footprint of your whelping setup and sits on your own flooring, matting or whelping pads, while the Jonart whelping box itself keeps its insulated raised floor for the youngest puppies. The open rail sides are the point: puppies can see the room, watch their littermates and get comfortable with household sights and sounds, you and the dam can see in at a glance, and air moves freely through the pen. That visibility makes this puppy play pen a genuine training space — room for first toys, first litter-box habits, first meals away from the box — and a natural weaning pen as puppies transition from the whelping box to the wider world.

Built Like the Jonart Whelping Box It Attaches To

This is not a flimsy exercise pen. The Jonart extension pen is part of the same modular Jonart system as the whelping box: a heavy duty plastic frame and FRP plastic panels held together with carriage bolts, so the pen is rigid, sturdy and strong enough for active litters — and smooth, hard and non-porous, so it wipes clean between litters. Lakeside's Jonart line is built for ultimate structural stability, and the extension pens are the matching modular expansion for that system: replacement panels are shared across Jonart whelping boxes and extension pens, so your setup can be serviced and reconfigured for years. Jonart products are crafted by Lakeside Products in Polk City, Iowa, and this extension pen is backed by a 1 Year Warranty.

Choose the Extension Pen Size That Matches Your Whelping Box

Extension pens are sized to match the Jonart Whelping Box - With Floor exactly. Order the same size as your box: the Small (30"L x 30"W x 15"Tall) pen fits the Small box, the Medium (36"L x 36"W x 20"Tall) fits the Medium, the Large (48"L x 48"W x 24"Tall) fits the Large, and the Extra Large (60"L x 48"W x 24"Tall) fits the Extra Large. Don't have the box yet? Start with the Jonart Whelping Box - With Floor and add this pen when your puppies are on their feet and ready to explore.

Size Chart

What's in the box: 3 extension panels — (2) side panels and (1) front panel. No floor panels are included. Whelping box sold separately.

Shipping

FREE SHIPPING ON ORDERS OVER $99.00 (excludes international, HI, AK). Oversize and heavy items are subject to additional shipping charges — the Large and Extra Large sizes carry the overweight/size flag. Expected ship time on Jonart extension pens is 7-10 business days after order. Once your order ships, you will receive an email with tracking information.