Canids: If I may nitpick, canines are the genus of especially doglike species, while what we're going for are canids, the family which includes foxes, wild dogs, and other assorted lovable weirdos. And I'm going to write a lot here, because I really like canids. So at this point, there really aren't any essential canids left, and I say that as someone whose most wanted is a canid. But there's also no denying that we've gotten a far more-than-proportionate number of canids, to the extent that we've already gotten multiple that would probably only be middlingly popular on today's meta wishlist if they weren't added when they were (dingo, dhole, arctic wolf), so I 100% do not expect the canid march to stop over the coming year. We've gotten canids in 7 out of 12 DLCs. They're going to keep coming, like it or not. 1 more would put us at 50% overall, 2 more would put us at 50% for 2023, but even 3 more doesn't seem completely outside the realm of possibility, all things considered.
So, that in mind, it seems more prudent to speculate on what they're going to be rather than what we actually need or whether we even need any more. Overall, I think the bush dog is the canid that adds the biggest bang to the current roster. South American and quite possibly objectively the most unique looking canid left to add? Sign me up. Plus there's the amusing anecdote that they were initially only known from fossils before being discovered to be alive. Not that that has any bearing on their in-game inclusion or anything, I just think it's a fun fact. Next up, naturally, I've got to mention my absolute favorite, the raccoon dog or tanuki. They're actually two distinct subspecies, with tanuki being another name for specifically the Japanese subspecies. Ultimately they're the same to me as far as inclusion goes. Realism would suggest that the mainland subspecies should get the nod (to my knowledge, it's likely the only one found in zoos outside of Japan), but I'm going to keep hoping for the tanuki specifically because a hypothetical Islands Animal Pack seems like either subspecies' best ticket in. Regardless, it would be very visually distinct as far as our remaining options go, add a bit of east Asian representation, and especially cap off Japan regardless of the subspecies chosen. If we get two more canids, I think these two are hands down the best route to take.
There's still plenty of other possibilities, of course. There's a handful that I consider to be probably just as likely as the bush dog and raccoon dog, even if they're less desirable. The coyote would continue Frontier's recent push for North American roadkill, and honestly do wonders for fleshing out native species collections, even if it's visually redundant with the gray wolf. The red wolf is also visually similar, but it at least tells a conservation story in the making. There are pushes from local legislature to go ahead and have it declared extinct in the wild, but the captive population is absolutely booming. I'm not clamoring for it, but I'd respect the hell out of the decision to include it. The gray fox is probably always going to be on the table, and would uniquely bring climbing to the table, but I'm not sure if another somewhat visually similar temperate fox is going to wind up being what gets the nod. If we do go for another fox, I think the bat-eared fox is hands down the way to go. Much more visually distinct from anything currently on the roster, and idk I just think they're a really fun species. Lastly I think a jackal bears mentioning, with the black-backed jackal being the one that checks the most boxes in terms of captive presence and visual uniqueness, but I think it would add little to the game compared to everything else I've mentioned aside from just giving us a jackal.
Then of course there's the whole prospect of untangling and possibly splitting the timber wolf into something more real, but I'm not really feeling typing out all the arguments there when I'm sure someone else will do it better and more convincingly. I could go either way on this one, personally.
Whew.
Apes: This is an easy one, thankfully. Give us the lar gibbon. Or nothing, either way. I'm not terribly fussed about it, but it does make sense to reuse one of the more unique rigs we've gotten lately, and it'd be nice to have gibbon options. I think really any gibbon that features a blonde coat would work here, but lars are the most popular and I assume most common one, so they make the most sense.
Suids: We need more, for sure. I feel like we should've gotten more by now though, because at this point I'm not sure how many I can justify cramming into potentially one year of DLC. The red river hog is the obvious frontrunner, and for good reason: fairly common, adds tropical African representation, and most importantly: absolutely visually striking. Easily a top 10 "need" species in my eyes. Second place would be the wild boar: common, iconic, perhaps one of the last best chances to get another native European species in the game. Following from that, I think the domestic pig (specifically, probably the kunekune or Vietnamese pot-bellied pig) also ought to be mentioned, again strictly because of the growing popularity of a possible petting zoo pack. They're not in my first tier of domestic picks, but hey, they are petting zoo mainstays. Lastly, I think the Visayan warty pig is worth bringing up, due to its critically endangered status, reasonable captive presence, and ability to slot into a hypothetical Islands Animal Pack as a unique ungulate choice. And to take that a step further, I just think they look kinda neat.
Gotta be pedantic again (sorry!): I'm sure this is where we're discussing peccaries too, even though they're just suines, the suborder that also contains suids. I hate being "that guy", but if we're discussing species taxonomically I feel like it's worthwhile to be clear and help spread some knowledge. I genuinely hope I'm coming across as helpful and not condescending. Regardless, either the collared peccary (common, low budget, represents both Americas) or the Chacoan peccary (endangered, strictly South American, slightly cooler looking?) work fine here and are very welcome. So that leaves us with no less than 3 piglikes that I think we really ought to have, but I'd be surprised if we got more than one. Red river hog > a peccary > wild boar is my priority order. I'd be happy with just the top two.
Mongooses: Unpopular opinion - we do need a second mongoose. If support does extend beyond 2023 I think they're practically mandatory, but even given what I predict our 2023 to look like (where they don't even make the cutoff for any hypothetical pack I could come up with) I could justify one sneaking in. They're just really common zoo species, and I'll never say no to small mammals. Honestly, I would've preferred mongoose 2 to hyena 2. The banded mongoose and common dwarf mongoose are easily the two most common species from my experience, but I was very surprised just now to find out that the yellow mongoose is comparably common in Europe. I most prefer the looks of the yellow mongoose, but no real preference overall.
Sorry for this absolute wall of text, I just kinda started going and didn't stop with this one.