If this is not a dog urine issue, or grubs, what else "could it" be, and what is the best way to analyze the problem? Is there anything I could try now to see if it helps?

Your dog may be more habitual than mine. Watch her and see if she likes that spot. Notice that I said "she". Male dogs squirt all over everywhere marking their territory. They also like trees, fence posts, and other places where it's not so much a problem for the lawn. If you have a male dog, he's not likely to be the cause.

Is that a property line there? Any chance your neighbor could have done something? Accidentally, I'm sure, but if you haven't spilled anything there, it's at least something to consider.

Maybe the heat exposed a localized dry spot. Have you checked the soil in that spot to see if it is even taking in the water you've been putting down?

You may find the soil in that spot to be dry as a bone despite your attempts at watering.

One of the reasons I'm somewhat paranoid, is that the great St. Augustine lawn we had for 17yrs died 2 years ago, and it all started with brown spots. Locals said that St. Augustine was hit hard by root rot in this area. When we removed the large over mature tree in the front yard, we put in the Bermuda, as there is no shade at all, all day.

Still, I'd probe deeper into the soil. 6-8 inches or so. As deep as your longest screwdriver. :)

Fertilized lately?

Bermuda loves heat and the rest of the lawn looks Ok. I'd rule that out too, unless maybe something was spilled there weeks ago and didn't burn until it got hot. I'm really grasping for straws here. If you don't know what might have burned it, I sure don't know. I'm more or less talking out loud to give you things to think about and maybe something will strike a chord with you.

For now, go whack that dead grass down. Let more light get down to where the new grass will regrow. (I'm being optimistic for you on the regrowth.) When my urine burns start to repair themselves, they don't just regrow from the sides, I get new grass blades coming up inside the burned areas. Can I assume that you're worried enough that you've been on hands and knees inspecting the area at dirt level?

If this is a drainage problem, all was well with water retention until 2 weeks ago. That's how long it took for this mess to appear. If this is a grub problem, I can't find any grubs. I fear I could lose my entire 9 month old lawn.

I had one small brown patch that showed up in another area several months ago. Still hasn't grown back. The few landscapers/TG that looked at it and rattled off a list of all the things it "could be" but had no real answers.

I thank everyone on this forum for their assistance. I just wish I knew where to get true professional help locally

He also told me I had trained my Bermuda too high (2 3/8"), and gave me some advice on how to scalp it and maintain it at a lower height next spring. I did scalp it this spring, but it looked so bad when I did, I set the mower higher when the tops turned green because I didn't want to go back to brown again (dumb mistake).

My question now is, as it has been recommended by one member to mow those areas down to let the sun get to it, is it wise to do that with the two hottest/driest months in TX upon us?

I do want to add that the dry brown areas have spread far to the right of the photo in a very linear fashion all the way to my back fence on the west side of the house, and based on my observations/experience, and my neighbors observations, no dogs have been using these areas to urinate.

I value all the opinions expressed on this forum, and I thank all for their suggestions/ideas. I just need to know whether I should chop these areas down now when the heat/drought of Texas summer has just begun. Thanks.