Just posting a follow up. I found a place offering free custom velcro patches with the purchase of a Julius K9 IDC Harness and they had the color I want in stock in Mira's size so I went with that brand and got custom patches that say "Afraid of Dogs". I ordered the reflective side patches shown in these photos from another place since I like those better than the one's that say "Julius K9" that came with the harness.
(Not sure it's okay to post links to online shops, but happy to share here if appropriate or through private message otherwise.)
If anyone is curious about sizing, Mira weights about 60 lbs and has a 29" chest circumference and I got the size 1 harness which seems to fit her well.
Chest measurement: 26 - 33.5 inches / 66 - 85cm
Weight: 50 - 66lbs / 22,5 - 30kg
Breed examples: Australian Shepherd, small German Shepherd, small Golden Retriever, Weimaraner, Husky, small Boxer, Pointer, Malinois
This was minutes after I put it on her the first time.
Disclaimer: I was bribing her to stay still for the photo with a chicken nugget and I think it was the chicken nugget that prompted the vigorous tail wagging. She didn't seem to mind the harness at all, though. Prob. too focused on yummy nuggets to care.
She's worn it every time we've gone outside since getting it. These were taken about a week later.
I know it's not meant to be a no pull harness, but I feel like she walks much nicer and pulls much less in the harness than she does with leash attached to her collar. Not sure that makes sense since I'd expect a harness with a wide chest piece to be more
comfortable for the dog when pulling and would encourage the dog to pull even harder than when the dog has to pull against a neck collar and pulling harder means choking and difficulty breathing, etc.
Maybe when she pulls, the force is more distributed so it doesn't feel like she's pulling as hard even though she is? Maybe she was taught to walk nicely in harness by her previous family? *shrug* No idea, but no complaints from me either way!