Animals Lack Attributes

Just because humans are uncomfortable with the subject of nudity, doesn't mean we're the only species to get our nudity censored in fiction -- it is just as common for regular everyday animals to get this treatment as well.

This is usually a concession of realism for the sake of the artist, as most artists would prefer to avoid drawing that part of an animal themselves, taboo or no taboo. It can also be a product of stylization, to which animals are especially prone, and which tends to remove unappealing or unimportant features, oftentimes to make them cuter (for example, stylized dogs tend to lack claws and lips).

This is technically Truth in Television for animals such as birds, reptiles, amphibians, fish, echidnae, and insects, whose genetalia are visible only as a small underside 'vent' between the rear limbs (and easy to miss even without feathers or scales to obscure them). That's not a form of censorship, it's just Law of Conservation of Detail (remember: Nobody Poops).

On the other hand, when depicting mammals (save for platypuses and echidnas), there's a common assumption that an animal's natural fur will adequately preserve the creature's modesty. However, observation of most real mammals will show that their fur is actually thinner in those places (so it doesn't get soiled when nature calls, and is easier to clean if it does). Also, many species' coats of fur are just too short to adequately conceal the features of their genital area in the first place. Anyone who has seen a male pig or male dog for example, will have no doubt noticed the prominent pair of features between its rear legs.

The sole exception to this censorship is the four teats of the female cow (and also quite often the male cow), which are always present, thanks to the iconic image of the country milkmaid. The only time cow udders were ever censored was in the early 1930s, when Moral Guardians became offended by the showing of Clarabelle Cow's bare udders in the 1930 Disney short "The Shindig." Other female mammals, even goats, are almost never shown with explicit mammaries, even in scenes where her offspring are shown nursing from her.

For the purposes of defining examples, only animals who are mostly or "completely" normal in physical appearance (e.g. not visibly anthropomorphized) and animal mannerisms should be considered. For cases where a creature is sufficiently anthropomorphized that the Uncanny Valley effect might occur (such as with Funny Animals in a few cases and especially with Petting Zoo People), see Nonhumans Lack Attributes instead.

Sub Trope of Anatomy Anomaly and Nonhumans Lack Attributes, and related to Barbie Doll Anatomy (the human version). Compare Funny Animal Anatomy. See also Appropriate Animal Attire for a broader discussion of modesty and clothing as it applies to animals.

Anime and Manga

 * In the Ginga Densetsu Weed anime, every dog is drawn this way, despite the fact one character is known for biting the testicles off of his enemies. This is sometimes averted in the manga though, as some panels clearly show genitals and anuses.
 * Averted in many anime appearances of Tanuki, raccoon-like creatures that are often depicted as having gigantic testicles as a symbol of luck.
 * In Naruto, at least with a certain giant armadillo.
 * Zig Zagged in What's Michael and Jarinko Chie: testicles (but nothing else) are shown.
 * Totally averted in Gon.

Comic Books

 * Averted in Bone with Roque Ja the mountain lion, who when seen from behind has a very prominent scrotum.

Animated Film

 * Averted Trope by volumes in Pom Poko, where the testicles of the tanuki are very prominent, both art- and plotwise -- though this is more due to the fact that tanuki having a very large scrotum is an aspect of Japanese folklore than any bizarre decision on part of the director.
 * Averted in the movie versions of The Plague Dogs The dogs as well as most other animals are drawn anatomically correct.
 * Zig Zagged in 'Watership Down''. Although the dogs are anatomically correct, the bucks are generally not drawn with anything showing no matter how close the camera comes.
 * Extremely applicable for the rats from Ratatouille, as male rats normally have testicles as big as their snouts. When Remy walks upright, his scrotum really ought to have been dragging on the ground.
 * Played painfully straight in Dumbo where all of the circus animals even have to rely entirely on Delivery Storks in order for them to have offspring.
 * Poor Bruce from Finding Nemo was originally animated with prominent claspers, as would be appropriate for a shark his size. Obviously they didn't make it to the final version.
 * Zig Zagged in Spirit Stallion of the Cimarron, where the titular horse sports a visible sheath in many shots, although played straigh with all the other horses.
 * Averted in The Triplets of Belleville. Bruno is anatomically correct.

Live Action Film

 * In the 1933 and 1976 versions of King Kong, Kong had no nipples.
 * Lassie is a female dog (note the root of the name is Lass not Lad) played by males with their belly hair coiffed very carefully to cover up the naughty bits.
 * Harry and The Hendersons played this one straight. Harry's fur is a bit thicker in that area, but such doesn't really conceal genitalia in hominids.
 * In Cats and Dogs, Lou is played by a couple of different beagles. Any scene in which he rolls on his back (particularly if someone is scratching his belly) will be played by a female, who naturally has less in that department. Despite this, Butch's comment on his immaturity is "He's still got his you-know-whats, for cryin' out loud!"
 * Shows up in the Scooby Doo, Garfield, Puss in Boots, and Yogi Bear live-action films, where they don't have the excuse of being cartoon animals. Of course, having to make them anatomical would lead to buckets full of Squick.
 * A deleted scene from Jay and Silent Bob Strike Back involving the Scooby Gang averts this.
 * A particularly curious example is in Son of the Mask where Otis the dog is partly played by a real dog and partly by horrifying animation. When the dog is real, it obviously has the equipment you would expect but as soon as it puts on the mask and becomes animated the downstairs department is noticeably lacking. This could have been handwaved as being an effect of the mask itself, had it not been for the fact that the whole premise of the movie is that a human male impregnates his wife whilst wearing the mask.
 * The 2010 version of Alice in Wonderland has the family of bloodhounds. The mother of the puppies has no discernible mammaries, and the father has nothing between his legs with which to create said puppies, even when he flops down on his side in front of the White Queen with his crotch pointed right at the camera.
 * It's Wonderland.
 * In "Rise of the Planet of The Apes" none of the apes have any genitalia. Chimpanzees have gigantic testicles, it's impossible to censor their parts without it being obvious.

Literature

 * This trope is invoked in-character in Thief of Time, when Susan takes a paper tube away from Jason and informs the boy that, no, the cardboard animal which the class is constructing is a polite horse.
 * Possibly a reference to a 19th century joke campaign to clothe animals: "A nude horse is a rude horse." was their slogan.
 * Very explicitly averted in Neuropath when Tom's dog rolls over and exposes his genitals. Agent Gerard find it hilarious and says it's so big it should get its own website. Then makes up some domain names. ("www.dog-got-a-bone.com")

Myths & Religion

 * Japanese statues of the tanuki feature the animal with large testicles but a very small or completely lacking penis.

Newspaper Comics

 * Zig Zagged in Footrot Flats. The trope applies to most of the animal characters, except for Cecil the sheep, who has very prominent testicles. Jess the dog and Dolores the sow also have mammaries when nursing.

Other

 * The mammary side of this trope is interestingly averted with the animatronic goats on the Pirates of the Caribbean ride at Disneyland Park at the Disneyland Resort; this is a very rare case of goats being designed with udders.
 * Bryer model horses, off the shelf anyway. The lack of genitals is the first thing that hobbyists customizing their models address.
 * Small pet rodents in films or television are virtually always played by females, even if the animal is male in-story. This is because male hamsters, rats, and mice have very large testes that would be virtually impossible to hide.

Video Games

 * Some dog lover found the Dog's lack of attributes so annoying in Dragon Age that he made a mod that put a modest sheath between his legs... and was promptly accused of interest for bestiality by the community members. This trope is strong in people's minds.
 * The fact that Pokémon lack visible attributes (with exception for Miltank's cow udders, of course) is likely a culmination of its simple visual art style and kid-friendly target audience (and G Rated Sex). The actual Mons can probably be assumed to still possess their attributes...after all, that Berry fertilizer (made in part from their "well, you know...") has to come from somewhere....
 * Various Pokémon draw their designs from things other than animals, so whether their attributes could even be identifiable as such varies as much as the Mons themselves. How exactly does one tell the difference between, say, a male and female Grimer -- living blobs of toxic goo? Eh, forget we even asked.
 * Can one tell between male and female "living blobs of toxic goo"?
 * Partial aversion in Final Fantasy XII--no monster has genitalia (or anything we would recognize as it), but a few do seem to have anuses--especially the wolf monsters.
 * Knights of the Round has the Mad Tiger enemy, which when knocked into the air is revealed to have a sizeable pair of balls.

Western Animation

 * Pretty much any time you see an animated animal belonging to a species that would have external genitalia in Real Life, even when they're not anthropomorphized.
 * In Code Lyoko, Odd's dog Kiwi is most definitely not neutered, as evidenced by the two lumps between his hind legs.
 * The My Little Pony Friendship Is Magic episode "The Best Night Ever" played with this trope. When Spike wants to be let into Rarity's boutique while the ponies are getting ready for the Grand Galloping Gala, she objects by stating they're "getting dressed", to which Applejack immediately points out that they normally don't wear clothes anyway.
 * In the episode "The Super Speedy Cider Squeezy 6000", Rainbow Dash wakes up Fluttershy early so that they aren't too late to get cider. Rainbow Dash pulls down the covers she's holding up over her, causing her to blush, even though she has no visible genitals (and they're all almost always nude anyway).
 * While generally played straight in Samurai Jack, one scene in the final episode required Jack to find milk for a lost baby boy, leading to a few depictions of female animals with visible udders, although his attempts to milk the wild animals were not entirely successful.
 * Zig Zagged with the miniature horses in one episode of The Oblongs. The horses lack genitals, but they have anuses that look like the letter "x."