Lakeside Products MagnaPen – Whelping Box Extension Pen (L)
Expand Your Whelping Space. Elevate Your Program.
The Lakeside Products MagnaPen L Whelping Box Extension Pen is purpose-built for serious breeders who demand more space, more control, and more versatility during the critical early stages of a litter’s development. Designed specifically as an extension to your MagnaPen Whelping Box, this L configuration creates a larger, safer transition area for growing puppies—supporting movement, socialization, and early training without compromising containment.
Whether you're raising versatile gun dogs, retrievers, or upland breeds, this extension pen allows you to scale your setup as your litter grows—because high-performance dogs deserve a high-performance start.
Designed for Growth & Development
The L Extension Pen provides the additional room puppies need as they begin to explore beyond the whelping box. It creates a dedicated space for:
Early mobility and muscle development
Safe exploration outside the whelping area
Introduction to potty zones and structured routines
Separation between sleeping and activity areas
This added space is essential for building confident, well-adjusted gun dogs from day one.
Built for Breeders Who Demand More
Constructed with the same precision and durability Lakeside Products is known for, the MagnaPen Extension integrates seamlessly with your existing system.
Key Features (L Extension Only):
Designed specifically for MagnaPen Whelping Box systems
XL configuration for maximum expansion and usability
Durable, easy-to-clean construction for kennel environments
Secure panel design to keep puppies safely contained
Quick setup and modular compatibility
This isn’t a one-size-fits-all solution—it’s a scalable system built to evolve with your breeding program.
Modular System Advantage
The MagnaPen system is designed with flexibility in mind. The L Extension Pen allows you to:
Expand your footprint as your litter grows
Customize your layout based on space and workflow
Maintain a clean, organized, and efficient whelping environment
Transition seamlessly from whelping to early-stage puppy development
It’s a system that works with you—not against you.
Why Serious Gun Dog Breeders Choose This Setup
Early development directly impacts long-term performance. Providing structured space during the first weeks of life helps build:
Confidence
Environmental awareness
Early independence
Cleaner kennel habits
For breeders focused on producing high-quality hunting dogs, this isn’t optional—it’s foundational.
Why Choose Black Mesa Gun Dog Supply
At Black Mesa Gun Dog Supply, we don’t just sell gear—we live the lifestyle.
Field-Tested Perspective – We understand what it takes to raise high-performing gun dogs
Curated Premium Gear – Every product we offer is selected for durability, function, and real-world use
Built for Breeders & Trainers – We support programs focused on excellence, not shortcuts
Trusted by the Gun Dog Community – From NAVHDA handlers to waterfowl and upland hunters
When you purchase from Black Mesa, you’re investing in a system backed by experience, not guesswork.
Build a Better Start
The Lakeside MagnaPen L Whelping Box Extension Pen gives your puppies the space they need to develop—and gives you the control you need to manage your program with precision.
Build smarter. Raise stronger dogs. Trust your system.
