I put mine horizontally on the outer thigh lately. The first time I tried the thigh I did it vertically without thinking but I think horizontal placement is what dexcom recommends. The one I have on now is hurting quite a bit on and off, so I think because I’m thinner now it must have gone into or against muscle or maybe it hit a nerve.
I switched from outer thigh to inner thigh. It’s only been a couple hours so far. It’s working good I am hoping this is a good spot for me.
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I’ve always assumed that this has to do more with body movement than with the dexcom itself, though. By placing it horizontally when wearing it on the abdomen you are less likely to have a problem bending over, for example, it presents a narrower profile that is likely to simply fold into a crease rather than a longer object that is likely to poke you with two ends. The movement of the waist is also more likely to be a lot of left/right twisting in the same direction of the sensor.
Vertical seems to make more sense on arms and thighs as the muscles beneath the skin (and thus the skin itself) tend to move that way, and would be tugging the sensor wire in that direction most often. I wear mine on my arm, vertical, with the small end down.
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I found that when it was placed vertically on my leg I’m more likely to accidentally rip it off when doing various things so I’m sticking with horizontal now.
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Well, that’s a pretty darn good reason! 
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I too am super sensitive to medical tape, Jen. I recently purchased grifgrips (http://www.grifgrips.com/) and I love them! After two weeks, the edges started to curl slightly, but still stayed on very well, with no irritation. I am also very active (I workout and shower daily), so it’s been a challenge up to now for me to keep my Dexcom on. I bought the medium and small rectangle shape in beige,
I haven’t tried anywhere but my stomach and upper buttocks/lower back yet in terms of placement, but I will give my arm a go too. I’ve never had success in the leg area with my omnipod, so I’m hesitant to try there, but I probably will give it a shot soon.
Thanks, I will have to try these!! I’ve seen them mentioned on Facebook, but have been hesitant to buy them just because my body hates so much of what other people love (can’t use Skin Tac or Tegaderm without a horrible rash developing, for example). The current tape setup I have doesn’t do well in water, which is partly why I have to keep changing the tape.
I too use grifgrips and they work great with no allergic reaction. I also use nasal allergy spray to prevent itching.
I can understand being hesitant to purchase something new. Most of the GrifGrips come in packages of 5 or more, but they do have a few that you can purchase just 1 of for <$2 USD. Shipping is free in the US, and I’m guessing about $1-$2 to ship to Canada?
I found this bedazzled monogrammed butterfly, a a monogrammed princess crown, and a monogrammed heart. Unfortunately the other “singles” that I found are all holiday options.
I’m wearing mine on my upper arm, vertically. Bought an ace bandage to wrap over it. Playing Siward in Macbeth and I’m afraid I’ll rip it off getting in and out of chainmail. Weird problem to have. Hoping it works.
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perhaps you could try Sleek Sleeves?
Caleb uses his arms and legs. Position is mostly vertical, but also do horizontal. I insert them both up and down - try to switch it up to make sure the insertion sites have a rotation.
I put it on my thigh all the time, vertically. It actually stays tighter, longer on my thigh than on my abdomen. (Make sure you don’t place it directly under a pants pocket; that can hurt)
Yes a made the mistake to place it on the outside of thigh. It was placed perfect so when I pulled my pants down so did the dexcom. I guess you learn from your mistakes.
I place my dexcom sensors on my upper thighs, slightly toward the inside. I used to do vertically and now I am putting them diagonally so I don’t catch them on underwear etc. They work very well for two weeks. I seldom even try to go longer.
So, my arm sensor ended up lasting 46 days before becoming too inaccurate to keep running. I put the new sensor on my upper abdomen, although I debated using my thigh, but I just couldn’t bring myself to do it (it seems more muscular than my arm and like it would hurt more). I removed the sensor yesterday and my skin wasn’t in as bad shape as I thought it would be (but wow was it nice to be able to scratch it properly!!). I went shopping with my mom today and when she saw my arm while walking behind me she went, “You’ve got a nasty rash!” But it was totally worth it for 46 days. I think I’ll give my thigh a try after this current sensor is done.
I thnk you must have set a record!! 
I think I saw a post on Facebook about someone who got 50+ days out of a sensor… Maybe that will be my next record!
I use upper arm side and I make sensors last more than 3 weeks as standard…
Never tried legs and my belly is hairy, so no chance to stick a sensor for more than 10 days…
I’m rather thin and have few spots with enough subdermal fat to put either a sensor or a pump infusor. Generally I do the infusors across my stomach, more or less at belly button height, and have four locations for the sensors that I sort of rotate among. Those are abdomen, a bit more than an inch (to upper end) south of the belly button and about 1-1/2 inch outboard, and thigh, vertically, top edge about 1-1/2 inch below “sit down” crease, and about half way between front and inside of thigh. Wherever I’m putting it, I always shave the area first in the shower. Lately I’ve been using SkinTac under where the adhesive is going to be, but after seeing some of the comments here think I’ll at least try grifgrips.