Canine! Love a great cookie and knot <3

Just my takes:

Evee feels fox like
Jolteon is dog
Espeon reads as feline to me
Umbreon is also feline to me
Glaceon is... I guess fox or feline?
Leafeon... fox like?
Vaporeon I honestly see as more of a seal than a dog or cat

My favorites are probably male jolteon and vaporeon.

They've always seemed more canid to me. Eevee is fox-like, Umbreon is jackal, etc.

Umbreon & Leafeon are my favorites. And I like both male & female!

I'm bias towards canine.

Honestly, I imagine them with canine, but espeon with feline due to being the one with the most cat-like appearance :o.

Canine

Leafeon and umbreon

Male, but they're one of the few I'm less picky on this over.

Canine!

Canine, but only cause i am heavily biased toward that. Feline just seems more pain then pleasure to me.

Canine for me. They're foxlike to me-- I prefer either male or female and my top two I think are.... Sylveon and a tie between Vaporeon, Flareon and Umbreon

They're adorable cats to me! Vaporeon and Sylveon are my favorites, of any gender!

Canine for males, a mix of canine or humanoid for females.

Umbreon and Leafeon are my favorites.

Canine, Umbreon and Jolteon, male all day long.

It depends on which eeveelution, but generally all canine genitals and I'm horribly gay so males uvu
I like Vappy with cetacean bits

I'm biased towards canine u//u

except Espeon; they're far too felid for me to ignore

I always viewed them more as canines due to what they evolve from. I favor flareon and jolteon the most since I used both of them at various times in the TCG, especially Dark Flareon. Vaporeon is very cute though. The ones beyond psychic and dark kinda lose out since they came out after I left Pokemon for Magic The Gathering. XP

I see them as canine.

My top two are umbreon and Espeon.

And I prefer males.

Eevee, Flareon, Jolteon, Umbreon, Glaceon, Leafeon, Sylveon: Vulpine/Canine Junk
Vaporeon: Dolphin Junk
Espeon: Feline Junk

Top 2 have to be Vap and Eevee.
Vaporeon being smooth would be a treat to phyiscally feel, and eevee being small means it's easy to fit a 4-inch (or less) stiffy in ur hand/face - which seems fun.

No sex preference, but fiddling with knots also seems fun.

I was gonna say mostly this but you said it clearer and with more precision than I was going to use.

This minus the knots comment on the end for thyself.
Female pref as well because I'm based

I think all of them are canine except Espeon personally, but most of them can go both ways. id probably give them all canine bits cause I prefer that over feline.

everything else, no preference

oh and Vaporeon I see more like a canine/dolphin hybrid so I'd give them dolphin bits or some hybrid of canine and dolphin

I say it depends on what they're based on. While I can see say Umbreon, Eevee, & the more canine ones like Leafeon, Sylveon, & Leafeon with canine lengths, the more feline looking Eeveelutions like Espeon can have a feline cock.. Jolteon & maybe Glaceon could have a mix of both. Vaporeon, being the water type could have maybe a mix of canine & fish cock? Idk.

As for genders, I kinda see Flareon, Glareon, Vaporeon & Espeon being more female, though Espeon, Vaporeon, Glareon can also be male imo. The others I can see more as males, especially Jolteon & Leafeon.

Canine, for sure though vaporeon I kind of picture as some sort of dolphin/canine hybrid. My top two favs are Vaporeon and Jolteon, closely followed by Espeon. Prefer female :)

Canine junk for all but Vaporeon, who has more cetacean-like naughty bits.

With canine (though Vaporeons more seal-like, than either canine or feline).
I don't have favorite eevelution, they all are neat :)
Both. Either females or males are fine.

I like a mix of the two, I'm gay so male only for me haha. I also like uncut on them, just not cut :p

Canine genitalia for male and female is a good starting point. They are typically seen as fox-like or dog-like to me, even Espeons. Although, in regards to Espeon mostly, I'm not terribly bothered by a bit of mixed genitalia. For example, a knot plus barbs, but trying to say that specifically Espeon is more of a feline than the other eeveelutions is a bit strange to me. Like, putting appearance aside, they all come from the same Eevee. Funny evolution nonsense could maybe bend them a bit more towards it, but surely not so much they become actual cats lol. I would ultimately just say Espeons are cat-like dogs/foxes.

Another case is Vaporeon. A cetacean weenor and genital slit is also good for male, and so is a simple slit for female. I've seen some people interpret them as being more like an otter or seal, which is pretty cool. In that case some other appropriate junk or the typical canine genitalia is good. Same sorta deal with Espeon to me. Dolphin-like fox, otter-like fox, seal-like fox, etc.

Personal favorites are shiny Espeon (if that wasn't obvious) and shiny Jolteon. Because hehe green. Although, I take a few liberties with Espeon because... looks at their toes. If you didn't notice before, you're welcome. : )

Prefer male, but anything is good.

I always do a double take when I see someone refer to Eevee or their evolutions as cats. I just see them as dogs personally.

I definitely see them with more canine bits, except Vaporeon who I see with dolphin bits.

My faves are Glaceon and Vaporeon.

And no preference really

Canine! Cookies are the best

Depends on the Eeveelution, Vaporeon for example I often imagine with more cetacean like anatomy, while say an Espeon is more feline-like.

The rest, I imagine with more canine-like anatomy.

My two favorite are Sylveon and Glaceon, both female.

Knots all around.

Jolteon is my favorite vee... Probably Eevee himself over Umreon.

Usually canine, but some I could imagine turning more feline like espeon, or cetacean like vaporeon

I believe their cocks would look kind of like how this person did for Red XIII.

https://www.furaffinity.net/view/36329171/

Most of eeveelutions with canine dicks with some exceptions. For example vaporeon looks nice with cetacean-like cock. Me personally prefer males in terms of art. Anyway, you may not count my comment, as i don't like eeveelutions, (and pokemon in general) as theres WAY too much of them...

As others said, canine works for most of them but feline for Espeon and cetacean for Vaporeon!