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- The famous "Taco Bell Dog" is often cited as the original source of the popularity of the Chihuahua breed.
- Morris the Cat, the 9-Lives cat food mascot, is sometimes cited as a pre-Garfield example of this occurring for orange tabbies.
- The mascot to the dog food company Cesar is a West Highland White Terrier. Advertisements for the brand helped boost the Westie's popularity.
- "Hush Puppies" is an American brand of shoes whose mascot is a Basset Hound. This has been cited as helping popularize the breed as a pet dog, instead of just a hunting dog.
- In the UK, the toilet tissue brand "Andrex" has been advertised by a Labrador Retriever puppy for decades - it is the UK's most popular dog breed. Doesn't hurt that Retrievers are a relatively docile and beginner-friendly dog breed.
- Paint brand Dulux started using the Old English Sheepdog as its mascot in the 1960s. The adverts have done at least as much for sales of the dogs as it has the paint.
Anime and Manga
- St. Bernard dogs became very popular because of the dog Joseph in Heidi, Girl of the Alps. Curiously, he doesn't appear in the original novel.
- The popularity of the 1977 anime Rascal the Raccoon was single-handedly responsible for the introduction of feral raccoons in Japan. Up to 1500 raccoons were imported as pets, but now the descendants of abandoned or escaped raccoons live wild in 42 of Japan's 47 prefectures.
- Hamtaro made many people want hamsters, and in some lands it was a true boom. It faded some years after, however.
- A relatively obscure dog breed, the Weimaraner, has gained popularity through William Wegman's photos and videos featuring this breed.
- The Saint-Bernard Rescue trope helped popularize the breed. It dates back to an early 1800s painting by Edwin Landseer.
Film — Animation
- One of the more famous examples is 101 Dalmatians. The film made the breed more popular, and as a result, demand jumped up. Like many "fad" animals, several were abandoned a few months later, aided by the fact that Dalmatians are very high-maintenance dogs that many owners aren't prepared to deal with.
- As with Dalmatians, Lady and the Tramp led to a sharp spike in demand for the Cocker Spaniel breed. The poor breeding done to meet the demand compounded the health problems the breed already had.
- When the film Rio came out, some people feared that the film would lead to an increased demand for parrots, which would've been particularly bad since parrots are extremely high-maintenance animals that need constant attention and lots of patience, not to mention they often live for several decades. Thankfully, that never came to pass, though likely for cost reasons; parrots (except for budgies) are expensive and run from several hundred to a few thousand dollars. Not exactly an impulse buy, especially for a first-time bird owner.
- Ratatouille caused a demand for pet rats. Not the worst case, as rats are relatively easy to care for even for a child, but it did lead to some abandoned rats.
- Finding Nemo made tropical saltwater fish popular for a while, which was pretty ironic because a major point of the movie was that fish belong in the ocean.
- All Dogs Go to Heaven increased demand for German Shepherds. Of course, German Shepherds have always been highly popular, and are an easy-going and relatively low maintenance breed.
- Demand for guinea pigs went up significantly for about a year after G-Force came out.
- Balto thankfully didn't do this for wolf-dogs (who are very high maintenance and more like wolves than dogs, not to forget illegal in many regions), however it did help boost interest in the Siberian Husky.
- It might have had something of a pseudo-effect of this trope: there was already a practice of selling Husky mixes as wolf-dogs (without even a drop of wolf blood in them) to owners wanting an exotic pet, and Balto's success increased viewer interest in the hybrids.
- Thanks to Zootopia's huge popularity in China, demand for red fox and fennec fox pets increased. Not surprisingly, wildlife experts express concerns for this trend since most foxes found on the pet market "are not commercially domesticated, often not vaccinated and can be dangerous".
- Averted with Coco. There were worries that Dante would cause a surge in Xoloitzcuintli's, however that didn't happen. It did however cause many people to learn about the breed.
Film — Live Action
- The Disney film Snow Dogs led to a short spike in demand for Huskies, the breed featured in the film.
- Legally Blonde is one of a few things that has been credited with popularizing Chihuahuas as "accessory" dogs.
- Marley and Me made the already popular Labrador Retriever even more popular despite the fact how high-maintenance Marley was.
- The original Our Gang shorts helped popularize the Staffordshire Bull Terrier (alternatively American Staffordshire Terrier according to some sources) in the early 1900s. Pete was smart, loyal, and good with kids, which made the breed become popular with families (to the point where it had a nickname of "Nanny Dog").
- 101 Dalmatians sparked a rise in the sales of Dalmatian puppies. The Dalmatian looks funny but is an extremely high-maintenance dog, and any child who thinks that this would be a good dog to own without the sort of dedication children are well known for being incapable of should be set straight rather than obliged in their request.
- The release of 102 Dalmatians, with a blue-eyed white puppy named Oddball, triggered a run on blue-eyed white Dalmatian puppies from parents who didn't realize that the blue-eyes gene is strongly associated with deafness. (You thought a hearing Dalmatian was high maintenance? Try a deaf one...) Blue-eyed white Dalmatians (and indeed, Dalmatians in general) were bred at such a rate that puppy mills would inbreed lines with extreme prejudice if they could get away with it. They usually did, and caused enormous damage to the breed in general, with congenital defects ranging anywhere from extra dewclaws to clubbed limbs to clinical insanity.
- Cujo inverted this trope. It caused a decline in the sales of St Bernard dogs (despite the fact the dog is actually rabid instead of naturally mean). This later ended up fixed by the release of Beethoven.
- The Air Bud franchise boosted the popularity of Golden Retriever, which was already popular.
- The Marmaduke film averted this, as the eponymous Great Dane is portrayed as being very high-maintenance to say the least. Certain animal welfare groups were concerned about this trope, but it doesn't appear that the film has done much to increase or decrease the popularity of Danes. The utter failure of the film at the box office probably didn't hurt.
- I Am Legend likely helped the popularity of German Shepherds.
- Beverly Hills Chihuahua did its best to avert this with a message in the credits saying, essentially, "make sure that you really want and are prepared to care for a dog should you get one." Ostensibly, this film is immune to the effect, as it was made in response to a terrible cultural trend that was already in existence (and apparently on the decline at the time). If anything, The Simple Life and Paris Hilton are to blame for the trend that led to the film.
- The only reason pretty much anyone outside of Africa has even heard of the Basenji is the 1950s novel and film Goodbye My Lady.
- Most people who saw Turner & Hooch probably couldn't have named Hooch's breed to save their lives. Demand for the French Mastiff didn't explode by any means, but that movie and other appearances in media have definitely invoked this trope, since it's a massive, high-maintenance dog that, as the vet herself said, "Not many people [have room for]." Or time for, or money for. And that's with the movie actually playing it fairly straight in terms of how high-maintenance Hooch was.
- Jurassic Park increased the demand for frilled lizards as pets, due to them looking like the portrayal of the dilophosaurus in the film.
- The Lassie and Lad A Dog movies (as well as the Lassie TV show) spawned such a demand for collies that pet breeders nearly managed to ruin what had been a really good breed. Even today, there are tons of badly-bred collies with poor health and the brains of an ice cube.
- The famous true story of the Akita Inu Hachiko and his two movies (one Japanese and one American) might easily lead some viewers on in wanting their own Akita puppy. While the breed is indeed known for their bravery and loyalty, the Akita should only be cared for by an experienced owner as they can be challenging to train and are actually prone to aggression, to the point that some countries have breed-specific legislation banning them or imposing specific responsibilities on their owners.
- The documentary Pedigree Dogs Exposed created an inversed reaction to this. It brought to the mainstream the health issues of various breeds such as the Cavalier King Charles Spaniel, Boxer, Pug, and German Shepherd. This in turn caused many people to get into mutts instead of purebreds and start protesting dog breeders. The documentary caused a lot of controversy around dog breeding in general.
- The popularity of Black Panther (2018), which is about a black panther-themed superhero, caused an increase in black cat adoptions.
- Surprisingly, the popularity of Harry Potter led to a big demand for snowy owls. So much so, that an owl sanctuary had to be opened to accommodate all the owls that were bought as pets but then abandoned.
- The children's book Stargirl provoked some readers to get interested in pet rats.
- The popularity of Shiloh caused this with Beagles.
- The popularity of Warrior Cats has gotten many people into cats. Since it's about feral cats, most aren't purebred so fans can't exactly be drawn to certain cat breeds, but fans often get interested in certain pelt colours due to liking characters with said designs. Some cats resemble breeds, such as Bluestar looking like a Russian Blue with the wrong eye colour and Yellowfang resembling a Persian, which also spurs interest in breeds.
- The popularity of Lassie led to a large demand for Collies. As with other dog breeds that come into this effect, several were bred to meet the demand, leading to unhealthy, inbred dogs. Many people blame this for health problems the breed has today.
- Game of Thrones caused a huge leap in the popularity of Siberian Huskies, and other wolf-looking breeds, due to their resemblance to the direwolves from the series. Unfortunately, not soon afterwards shelters began reporting an increase in Huskies due to people abandoning their dogs. Huskies are a large, high-energy breed that aren't recommended for beginners.
- The 1970s series Baretta, with Robert Blake as a plainclothes police detective, caused a surge in the popularity of sulphur-crested cockatoos as pets (on the show, Tony Baretta has one named Fred). Unfortunately, a lot of people undoubtedly regretted the decision to purchase one, as the birds can be troublesome, loud, demanding pets who chew on just about any solid material they can get their beaks on.
- Nintendogs Defied this by including a message in the manual:
Nintendogs is an interactive entertainment experience centered on puppies. In the uniquely imaginative world of Nintendogs, the young dogs do not age, always remaining puppies. They boast docile habits and personalities, and are easy to handle.However, since real puppies are living things, they have habits and personalities that may be different from those of the Nintendogs, so when training and caring for a real puppy, please be sure to understand the real puppy's habits and personality.When caring for living dog, the trainer holds ultimate responsibility for the survival and well-being of the dog, so be sure to consult with your family before raising a real dog.
- Sonic the Hedgehog did give some popularity to pet hedgehogs. Adding to this, one of the most popular pet hedgehog names is "Sonic".
- Shiba Inus have experienced a spike in popularity thanks to Doge the Internet meme, according to the experiences of Jonathan Fleming, the photograph of the picture that would become the "hipster doge." Fans of the breed advise against first time dog owners owning them. While not bad pets by any means, Shibas are quite a stubborn breed (to the point where many call them "cat-like") and could be hard to handle for inexperienced owners.
- Many Youtubers who own unusual pets like foxes will try to prevent this by putting disclaimers in the video descriptions pointing out the difficulties of owning such a pet.
- The fad for pet red-eared slider turtles that began when Teenage Mutant Ninja Turtles was a big deal on TV. A lot of imported turtles were abandoned after the show fell out of favour and the luckiest of them were dumped in rivers and reservoirs. Various areas of Britain report that water features suddenly developed resident turtle populations after the end of the show's run on TV, possibly when owners realised they weren't going to morph into superheroes and that the real thing is rather prosaic and boring - and possibly long-lived. Sefton Park in Liverpool, for instance, now has an unwanted turtle population which defies attempts to cull it and is a pest, preying on native fish and wildfowl. Fishermen across the UK hate the imported alien population of snapping turtles, for their part in depleting fish stocks. Attempts are periodically made to cull them.
- Many people want a Great Dane due to Scooby-Doo. This is despite Scooby intentionally being the antithesis of what a Great Dane "should" be like. The creators researched Great Danes and made Scooby the opposite of breed standards.
- Dan Povenmire and Jeff "Swampy" Marsh were apparently aware of this trope when they developed Phineas and Ferb, which is why they deliberately gave their protagonists a pet that was impossible in real life, an animal that kids could not "pick out at a pet store and beg [their parents] for". Perry is a Platypus.
- Rufus the Naked Mole Rat in Kim Possible has led to kids wanting one for their very own. Common sense provides it's not really a Speech-Impaired Animal in real life, but what even parents might not know is that the naked mole rat is basically blind, not cute, and one of the only mammals that are eusocial — like bees — and so can only survive in an underground colony with hundreds of other mole rats.
- Paris Hilton is often credited with/accused of (depending on who you ask) popularizing tiny "purse dogs" like Chihuahuas.
- Demand for Portuguese Water Dogs went up 50% after the Obama family adopted one so that the allergic daughters could have a puppy.
- An odd example in that the news is responsible, and a rather tragic one at that: All of the news stories regarding pit bull attacks and dog fighting rings has solidified their image as vicious attack dogs (which isn't accurate), leading to a rise in their popularity amongst unscrupulous owners who just want a tough-looking dog to show off, or, worse yet, to fight against other dogs. Many of these dogs will end up being abused or left tied up in backyards, which causes them to develop behavioral issues (as any dog, not just a pit bull, would in that scenario), and eventually leads to yet another incident of a pit bull attack, and the subsequent news story, and the cycle continues. Dobermans and Rottweilers also suffer from this, to a much lesser extent, but the pit bull breeds tend to get the worst of it. You can, of course, also blame the jerks who run dog-fighting rings for this problem.
- This has happened with people. It was trendy for dames at the French royal court to have a black dwarf servant following them around after Louis XIV's wife was gifted a dwarf slave by the King of Dahomey, named Nabo. The fad came to an abrupt end when the Queen gave birth to a black daughter and Nabo abruptly disappeared from the historical record.
- The American president Theodore Roosevelt helped popularize the Rat Terrier.