In terms of both the wider furry community, and ABDL, there's an NHS MTF transgender psychologist who works for the Tavistock who has written a book (available on Amazon) describing furry, ABDL, DDLG, and related paraphalias as completely ok and not related to paedophilia or anything that psychologists should be alarmed about, and that ABDL & DDLG can be non-sexual therapy for people sexually abused as children.
In fact, the ABDL community directly courts adolescent boys, in that ADISC, a website which teenagers nocturnal enuresis would come across just from googling their embarrassing condition, is in fact not at all a support group for people with incontinence, but rather a straightforward fetish site, albeit not that overt because it's a text forum.
Note that 14-year-old AC had a blog (while still id'ing as male) on a forced incontinence/ABDL website where it was made quite clear that he was a 14-year-old boy blogging about ABDL (the site was an ABDL sexual fetish site, so the content, sexual fetish stuff, was more generally mostly by adult men).
I haven't looked too closely but I'm guessing that ABDL is linked to things like menstrual fetishism (one teenage MTF fetishist who is suing the US government for transgender discrimination boasted of wearing 'drynites' during his 'period').
As far as furry goes, there was a very illuminating post I found on one of @mimmymum (Mermaids advocate, parent of FTM child) followers (very good place to look for vile perverts, IME), but unfortunately I've lost it. However it was titled 'an apology to the furry community', and essentially related how the author, a furry (I don't remember if MTF or not) had been groomed by paedophiles as an adolescent, and had called the 'furry community' a hotbed of paedophiles, but had come to recant this hot take, after finding that not ALL furries were paedophiles, merely a lot of them, and some furries are anti-paedo.
This account used the term 'pup fur', which apparently can refer to an underage furry (13/14 or so). Apparently there is some sort of 'career pathway' in that people like AC joined Furaffinity as a 13 or 14 year old and identified as such but was expected to keep off the adult content by, well, an age box. So you are a 13 or 14 year old on the same site as people with dog rape fantasies, but it's ok because the 13 or 14 year olds are doing it non-sexually, at least until the second they turn 18 (or before, if they just lie or create an alternate account), when it turns into a big animal sex furry orgy. (And btw from what I've seen furries and ABDL people do seem to argue that it's nonsexual, but this is from what I can see just part of the role play.)