sorry about the smell...and sorry about my answer...but i couldnt help myself..... "let a cat pee on it"

actually scrub floor and walls with one of the over the counter paint scrubs and then seal it with a paint sealer..just tint it and no need to paint again. the sealant becomes the paint. as for the concrete a sealer can be used there too. we had this when in old homes one of the family members would go to the garage to smoke for 20 years

Tons and tons of pine tree air fresheners hanging from the ceiling

Thats the bacteria you are smelling. A bleach wash will do the trick

Bleach wash is an easy fix so try that first. Otherwise Mike Rock 's suggestion is the answer, just more work to get it done. 

Bags of charcoal will help to absorb this, best to crush it a bit.

Charcoal

Remove the dog? 

If the smell is the result of the paraffin from the dogs fur then a good cleaning is all that is needed of areas below what the dog can access.

Howeverif the aroma is from other biological fluids, replacement may be needed.

May I suggest that you analyze what else is in the garage. Is there a moisture source? Finally, go to those shelves and note what chemicals are present. Are the bottles empty? The smell can be originating from evaporation of all those weed, feed and kill chemicals.

In one house I moved the chemicals to on outside bin and problem solved.  The poor  doggie pouted, "I told you I didn't do it."

Crushed charcoal was my choice and verified by Bob Crane!

I just went through this with a listing I had  - depending how bad the odor is - I hired merry maids to go in top to bottom and clean and fumigate the entire house and hired a lawn guy to dig up the back yard and replant - it was really terrible.

If it's not too terrible, repaint and spray Odor Ban

Bob Crane got my vote on this one. I use charcoal in open containers in homes where there were smokers. In a few days the odor is gone. Works well on just about all oders. 

I'd say have a restoration company clean and seal the walls and flooring....then repaint it....

Bleach and TSP scrub down or find/borrow an Ozone/ion machine.

Melissa,

I like Mike Rock 's suggestion.  A

Kilz the walls and the ceiling, Seal the floor.

A fresh coat of paint on the far wall, and scented candles at the entrance of the garage. Burn the candles for two hours the day before the next showing and then for half an hour just before the showing. You might also want to plug a microwave in and heat up some chocolate chip cookies with a couple of drops of milk in the center of each one. Of course the best way to win this one is to have the current owner, or a friend BBQ just a few minutes before the next showing. It's very easy to mask the smell. As for a great way to remove that smell, douse the floor with a couple of boxes of baking soda and let this sit in there for a couple of days before your next showing. Clean it up with some pine floor detergent just before the showing. Smell will be gone!

[George L. Rosario, NYC's Hometown Realtor, Coldwell Banker Kueber, the Rosario Shalomayev Team, #glrosario #RosarioShalomayevTeam]

Had a similar situation. Check with a fire damage remediation company for an ionizer then follow Mike Rock 's recommendation. It might be that when that concrete was poured, a vapor barrier was not used and this will be an ongoing issue.

Bleach....The old remedies are often the best...

I would try Ron suggestion.

1. Remove the dog. 2. Complete wash 3. Odor absorbing material

parked and reading...

I do not know.

Ronald Gombach has it down for you. That's what I'd do with a power washer to boot.

Power wash and paint the floor.

tear down the sheet rock, replace the rotting wood and that should do it.  If something smells wet it generally is wet or has been

Would Kilz work?

Set out bowls of vinegar to help absorb the odor. You will be surprised at the difference it will make.

Here may be a solution.

Solution  <-----

I will pour vinegar/lemon flavor/baking soda to neutralize odor. May be I will use a shampoo machine for the test.  Hot water.

You paint the floor seal with epoxy completedly and disclose it before you get sued.

About  25% the house esp rentals got dog/cat  pee. People replace the flooring and left subfloor satuarted from previous owner waste.

I smell it today them. The owner quietly told me the tenants he evicted had 30 poppies inside...

Wow!  Wet dog is bad enough in chilled air conditioning!  Isn't there some ion cure?

Mike Rock solves the problem.  Then find buyer who loves wet dogs.

Killz is amazing stuff.  Give that a try.

I'm with Barbara Todaro on this one. Great answers everyone!

I really had no idea but there are some good suggestions below. Perhaps also running a dehumidifier?

Great answers everyone.  AR rocks!

Bleach scrub everything,  with a fan on blowing out.  Kilz premium paint a few days later and pray it does the trick.  It has worked for me up in Wisconsin. 

After a thorough cleaning and airring...try this:

http://activerain.com/blogsview/4894891/charcoal-is-not-just-for-bbq-s-----

Seems like most of the good suggestions have been made. All I can add is that if you need to hire professionals, make sure you call a few places and see what they plan to do. You can usually tell from this action plan who wants to charge your for superfluous services.