You love letting your dog enjoy the backyard, but you’re tired of getting up every time they scratch at the sliding glass door. Maybe you live in an apartment or rental where cutting into the wall or door isn’t an option. A sliding glass pet door is the perfect solution, and PetSafe offers several medium-sized models designed for dogs up to 40 pounds. In this review, we’ll break down the best PetSafe sliding glass pet door medium options, compare their features, and help you choose the right one for your home and your furry friend.

We’ve evaluated the top PetSafe models based on installation ease, energy efficiency, security, and durability. Whether you need a simple one-piece design or an extreme weather version, we’ve got you covered. Let’s dive in and find the perfect door for your pup.

Buying Guide: What to Look for in a PetSafe Sliding Glass Pet Door (Medium)

Size and Fit for Your Dog

The most critical factor is choosing a door with the correct flap size for your dog. For medium dogs up to 40 pounds, look for a flap opening around 8.25 inches wide by 13 inches high. PetSafe’s medium models, like the PetSafe Sliding Glass Pet Door, 1 Piece (white) or the black version, offer these dimensions and are designed specifically for this weight range.

Always measure your dog’s height and width at the chest to ensure they can pass through comfortably. A door that’s too small will discourage use, while one that’s too large can let in drafts and compromise security. Check the product specifications for the exact flap dimensions before purchasing.

Installation and Rental-Friendliness

If you rent, you need a pet door that doesn’t damage the door or frame. PetSafe’s one-piece designs are ideal because they fit into the existing sliding door track without any cutting. The installation is a simple DIY project that usually takes less than an hour. The patio panel adjusts to fit door heights between 75 7/8 inches and 80 11/16 inches, which covers most standard sliding glass doors.

For those who want even more flexibility, the PetSafe Sliding Glass Pet Door, Aluminum Frame (medium) is also easy to install and remove. It uses a frame that fits into the track, so you can take it with you when you move. This is a huge advantage for renters who don’t want to leave a permanent fixture behind.

Energy Efficiency and Weather Resistance

Sliding glass doors are notorious for letting heat escape in winter and cool air out in summer. A good pet door should minimize this. Look for models with magnetic closures on the flap, weather stripping, and tinted or insulated flaps. The PetSafe Extreme Weather Sliding Glass Pet Door takes this a step further with three insulating flaps and dual-paned glass, making it a top choice for extreme climates.

Even the standard PetSafe models include a slide-in closing panel, which you can use to block the door entirely when your pet doesn’t need access. This helps maintain your home’s temperature and can also act as a security barrier. If you live in an area with harsh winters or hot summers, consider the extreme weather version for better insulation.

Security and Durability

Your pet door is an entry point into your home, so security is paramount. PetSafe doors come with a latch kit that locks your sliding glass door once the pet door is installed, preventing intruders from sliding the door open. The frame materials also matter: aluminum frames and shatter-resistant tempered glass are more durable and harder to break than plastic alternatives.

For added peace of mind, choose a model with a sturdy lock on the pet flap itself. Some PetSafe doors allow you to lock the flap in a closed position, so your pet can’t go out when you don’t want them to. This is especially useful at night or when you’re away. For more on securing your home, check out our weatherproof pet door reviews for additional tips.

Final Thoughts

Choosing the right PetSafe sliding glass pet door for your medium-sized dog comes down to your specific needs: if you’re a renter who wants a simple, no-drill installation, the PetSafe Sliding Glass Pet Door, 1 Piece is a fantastic choice, offering a secure fit and easy removal. For those in extreme climates or who want maximum insulation, the PetSafe Extreme Weather Sliding Glass Pet Door is worth the extra investment, with its triple-flap design and energy-efficient construction. Both options provide the freedom your dog deserves while keeping your home safe and comfortable.

Frequently Asked Questions

Can a PetSafe sliding glass pet door be installed in any sliding door?

PetSafe sliding glass pet doors are designed to fit most standard sliding glass doors with a track height between 75 7/8 inches and 80 11/16 inches. You should measure your door’s track height and width before purchasing to ensure a proper fit. Some models, like the one-piece design, are adjustable within this range.

Will a medium pet door fit my dog that weighs 40 pounds?

Yes, the medium PetSafe sliding glass pet doors have a flap opening of about 8.25 inches wide by 13 inches high, which is suitable for dogs up to 40 pounds. However, you should also consider your dog’s chest width and height. If your dog is taller or broader, you may need a large size. Check the product dimensions and measure your pet.

How do I lock my sliding glass door with a pet door installed?

PetSafe sliding glass pet doors come with a latch kit that secures the sliding door in place. You mount the included security bar between the door frame and the interior sliding panel, preventing the door from being opened from the outside. This ensures your home remains secure even with the pet door in place.

Are PetSafe sliding glass pet doors energy efficient?

Yes, most PetSafe models feature a tinted, flexible flap with magnetic closure and weather stripping to help keep outside temperatures from entering your home. The Extreme Weather version goes further with three insulating flaps and dual-paned glass, making it ideal for extreme climates. For more on energy-saving options, see our weatherproof pet door reviews.

If you’re still deciding between sizes, our best large dog door reviews can help if your pup is over 40 pounds. Also, check out our PetSafe sliding glass pet door review for a broader look at the brand’s lineup.