We used Bellawood Brazilian Koa in an addition that has a concrete slab 5 yrs ago and we couldn't be happier with the results. We choose not to do the floating installation. Here are the instructions we followed:

Nail‐Down Subfloor System Over Concrete
• Use minimum 3⁄4” (23/32, 18.3mm) CD Exposure 1 Plywood subfloor panels (CDX), 4’ x 8’ sheets.
• Concrete should be flat to within 1/8” over 6’ or 3/16” over 10’.
• Install Dream Home 6 mil polyethylene sheeting over the concrete for moisture protection. (completely cover concrete,
overlap seams 6”)
• Concrete compressive strength must equal 3000 psi or better.
• Note: Fasteners may be powder‐driven pins, pneumatic driven nails, or other fasteners suitable for concrete application. Check
with fastener manufacturer for specification such as length, drill size, and/or shot load where applicable.
• Stagger panel joints allowing approximately 1/8” expansion space around all panels to prevent edge peaking due to
compression caused by panel swell.
• Allow 3⁄4” minimum expansion space at all vertical obstructions.
• Panels should be mechanically fastened. For powder load or pneumatic pressure information, contact the manufacture.
• Nailing requirements, minimum 32 shots per 4’ x 8’ panel.
• Areas with higher humidity may require additional fasteners.
• Use 1-1/2” long fasteners when nailing 3⁄4” flooring to this subfloor.

I would go with a engineered floor first sealing floor, then glue down. Follow flooring instructions. Since engineered flooring expands and contracts less than hardwood should be an easy install.

I should mention that we had major humidity issues after Sandy came to visit us here at the Jersey Shore. Our hardwood over concrete did wick in some moisture and buckled a bit. We were so worried they could not be saved but a builder friend of ours suggested waiting it out and after a summer of running the AC, the floors are just fine :)

Amy sorry to hear about Sandy, make sure that mold had not started under the floor. AC lowers the humidity so mold will not grow but does not kill mold spores. Even though Winter heating will remove humidity you should buy a humidity meter to keep an eye on humidity thru the year.

Thanks fredm51 :) We ripped out all damaged drywall and insulation within the days following Sandy and had professional mold remediation conducted on the entire home a week later. Hopefully there is nothing growing between the wood and concrete hadn't thought of that.

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Until we see a better solution developed we will always recommend engineered wood floors over a concrete subfloor. Any application of a solid wood floor over a concrete subfloor requires too many moving parts, too much expense and unnecessary risk.

Thank you all for your suggestions. We ended up with engineered acacia, it was installed yesterday, and so far we love it!

We just installed strand bamboo over c1952 tile (mastic glue probably had asbestos so didn't disturb), on concrete slab, after having carpet removed. Came out well. Product was from iFloors and had separate contractor to install. We're pleased. Bamboo is very, very hard.

Love bamboo but worried about using it over concrete slab. Anyone else have thoughts or experience--especially for Florida climate?

I'm also curious about using linoleum instead of vinyl. Does anyone know if that works well on a slab-house floor?

You have two very large dogs - have you considered tile? That's a lot of weight on small nails, especially if they decide to do hot laps through the house :)