Do you immediately go to Dot / Dottie ?
I’m considering Dorothy with nn Dora but she couldn’t go by Dot or Dottie as it rhymes with our surname. I wouldn’t want her to always be saying “no not Dottie…” etc or for it to be made into a joke that her names rhymed.
If I had to choose something I’d probably say [name_f]Dottie[/name_f], but I wouldn’t automatically call her that! If a [name_f]Dorothy[/name_f] tells me she goes by [name_f]Dora[/name_f] I’d use that one 
I think most people would go for Dot/Dottie,
What about [name_f]Isadora[/name_f], nick name [name_f]Dora[/name_f]?
unless i was told otherwise, i wouldn’t shorten it at all
The most well-known nickname is definitely Dot/Dottie, although I think [name_f]Dora[/name_f] is actually more intuitive and uses more sounds from [name_f]Dorothy[/name_f] than [name_f]Dot[/name_f] and [name_f]Dottie[/name_f]. Other nicknames are [name_f]Dolly[/name_f], Dody, [name_u]Dory[/name_u] and [name_f]Dee[/name_f] which shows that you can have other nicknames for [name_f]Dorothy[/name_f] that aren’t Dot/Dottie. You could go for [name_f]Dorothea[/name_f] or [name_f]Theodora[/name_f] which are less associated with Dot/Dottie and can still use nickname [name_f]Dora[/name_f], but to be honest, I think that it is an easy correction to make and being [name_f]Dorothy[/name_f] nn [name_f]Dora[/name_f] wouldn’t cause significant problems.
If somebody were to ask me for nicknames for [name_f]Dorothy[/name_f] I do think of [name_f]Dot[/name_f] straightaway, however I wouldn’t assume that a [name_f]Dorothy[/name_f] goes by [name_f]Dot[/name_f] and I definitely wouldn’t automatically call a [name_f]Dorothy[/name_f] ‘Dot’. I think Doras beautiful!
I don’t think I’ll go to [name_f]Dot[/name_f] straight away, it’s not that obvious. If [name_f]Dora[/name_f] says she’s nicknamed [name_f]Dora[/name_f], then I think most people will call her [name_f]Dora[/name_f]. Anyways, [name_f]Dora[/name_f] is really awesome for [name_f]Dorothy[/name_f]!
I probably wouldn’t automatically shorten [name_f]Dorothy[/name_f] but [name_f]Dora[/name_f] feels pretty intuitive
i would shorten it to dory! i love dot, but i wouldn’t assume it. dorothy “dora” is so sweet and works perfectly
I love Dot/Dottie for [name_f]Dorothy[/name_f], but I definitely wouldn’t default to it without being told what the person preferred! [name_f]Dora[/name_f] is so sweet and seems perfectly intuitive to me–I think it would catch on easily as a replacement.
[name_f]Dorothy[/name_f] is an adorable name. I love [name_f]Dora[/name_f] and [name_u]Dory[/name_u] as nicknames!
Intuitively, I’d say [name_f]Dot[/name_f]. But if she wanted to go by [name_f]Dora[/name_f], I’d call her [name_f]Dora[/name_f]
I think [name_f]Dora[/name_f] is pretty intuitive. I haven’t met any young Dorothys so I don’t know how likely it would be to be nicknamed Dot/Dottie nowadays.
If it were me I’d try to get the nickname [name_f]Thea[/name_f] to take off!
[name_f]Dotty[/name_f]
I think it’s been so long since Dorothy was used commonly that people wouldn’t automatically assign a nickname to a new baby Dorothy. I would not assume that today’s parents were going to go with Dottie.
Dot is just my preference, but I think people would easily use Dora. It’s a known nickname for Dorothy right along with the others. If you want an extra degree of separation from Dottie, you could consider Dorothea.
I think of it as like [name_f]Eleanor[/name_f], I wouldn’t just call an [name_f]Eleanor[/name_f] “Nell”, unless I was told she goes by that. [name_f]Dorothy[/name_f] is beautiful and I think [name_f]Dora[/name_f] is a perfect nickname. I’ve also met a [name_f]Dorothy[/name_f] who went by [name_f]Thea[/name_f]!
I really like [name_f]Dot[/name_f], but I do agree that [name_f]Dora[/name_f] is a super cute alternative. 
[name_u]George[/name_u] bush called his daughter [name_f]Dorothy[/name_f] “Doro”
[name_u]Ori[/name_u], [name_m]Ory[/name_m], [name_m]Oro[/name_m] and [name_u]Dory[/name_u] would work.
Maybe [name_f]Ro[/name_f] or [name_f]Doro[/name_f]?