We brougt our Beagle, Lab and cat from Houston in March of last year and had no problems whatsoever...we contacted Qatar Pet Relocators (http://www.qatarpetrelocators.com) and they made everything very easy for us.  Upon departure from Houston, Lufthansa staff was extremely courteous and helpful, letting me stay with my dogs until the last possible moment before taking them away into cargo.  Not sure where you will be flying from either, but August is a very warm time of year throughout the US, and most carriers won't take pets on the plane if the temp is too high...you may want to check this out.

Once we arrived in Doha, the dogs came out after all of the baggage and I was able to wheel them right through the customs check...they didn't ask for any of the paperwork, but I did have it ready just in case.

Our dogs are indoor dogs as well for the most part.  We purchased a "doggie-door" before we left Houston and had it installed for them in our villa here so they can come and go into the back "yard" as they please...heat hasn't been an issue.  

I would also stock up on pet-meds...you can get everything you need here, but it comes at a premium.  Vet care here is great as well...