Is it better to use a concrete pad or a wooden platform for a doggy door exit?

Floating a concrete slab is usually better than anchoring it for something this small. If you anchor it to the foundation and the ground settles, it'll put weird stress on the house or crack the slab. If you go the concrete route, put down 4 inches of compacted gravel first. That handles the drainage and keeps the slab from heaving too much during freeze-thaw cycles. Keep the top of the concrete at least two inches below the bottom edge of your vinyl siding to avoid moisture wicking into the sheathing.

Wood is way easier to adjust if you're worried about the height for an older dog. Since it's only 8 inches off the ground, don't use standard pressure-treated lumber from a big box store—look for wood rated for **ground contact**. Most 2x4s are only rated for above-ground use and will rot in a few years if they're that close to the dirt. You can set the frame on concrete deck blocks or even just solid pavers to keep the wood off the actual soil. The real danger with a low deck isn't just rot; it's the lack of airflow. If you build a wood box right against the house, leave a half-inch gap between the deck frame and the foundation. You can use some spacers to keep it steady. This prevents leaves and wet gunk from getting trapped against your siding. If you're worried about your lab's paws, use a composite material for the top surface so she doesn't get splinters as she ages. For a small doggy deck, you don't need deep footings. A floating frame is fine. Just make sure the ground underneath is level and well-drained. If you go with a ramp instead of a step, make sure the slope isn't too steep for her hips. A 1:12 slope is the gold standard for ramps, but for a dog, you can get away with a bit more as long as you add some grip tape or small wooden cleats for traction.

If you're going the wood route for your lab, skip the heavy pavers and grab some TuffBlock deck supports. They’re super lightweight and won’t sink like bricks. For the surface, I’d highly reccomend Trex Transcend decking. It stays way cooler than cheaper composite brands, wich is a lifesaver for older dogs' paws during summer. Plus, it’s basically scratch-proof so her nails won't chew it up. I built a small ramp for my retriever using those exact materials and it’s held up perfectly against the damp ground without any rot. Just leave that air gap and you’re golden.

One must account for the accelerated corrosion of standard galvanized hardware when in direct contact with alkaline copper quaternary treatments used in ground-contact lumber, so I whould highly recommend sourcing 305 or 316-grade stainless steel screws for the assembly regardless of which frame you build. Additionally, given the proximity to the soil and the inevitable lack of vertical ventilation in a low-profile build, applying a high-quality butyl joist tape to the crown of each framing member will significantly mitigate the risk of interstitial rot caused by moisture entrapment between the decking material and the joists, which is a failure point many folks overlook untill the boards start sagging.

I've built dozens of these low-profile landings over forty years. Everyone talks about the rot, but nobody mentions the skunks. An eight-inch gap is a five-star hotel for critters. Back in the day, we’d staple heavy-gauge hardware cloth around the perimeter and bury it a few inches deep. Saved many a homeowner from a smelly surprise. Also, if that lab has stiff joints, skip the fancy composite; it’s slicker than owl grease when it rains. I’d stick to rough-sawn cedar. It’s got natural grip and smells better than that chemical-soaked PT stuff anyway. Just keep an eye on the splinters as it ages.

I'm super new to all this and honestly the mention of skunks under the deck has me a bit spooked! I hadn't even considered that. Since I’m just starting out, how wide shold the actual landing be so a big dog doesn't accidentally step off the edge while she's turning around? I don't want to make it too small. Also, do those TuffBlocks just sit right on the grass, or do I need to clear the area out first? I'm worried about it being wobbly if I don't prep the ground right, but I'm not sure how much digging is acutally required for something this tiny.