In China, a tiny new addition to your family is just a few clicks away — and can even be delivered straight to your door.

But there's no guarantee they will survive being transported through China's postal system.

Key points: Small pets are being bought online and delivered through the post in China

Small pets are being bought online and delivered through the post in China JD.com, China's largest online retailer, says it is looking into the issue

JD.com, China's largest online retailer, says it is looking into the issue Pets are also being bought online and delivered in Australia, but not in the mail

Warning: This story contains images that some readers may find disturbing.

Vendors on the country's two biggest online shopping sites, JD.com and Taobao, sell a variety of live animals ranging from cats and dogs to more exotic options like African hedgehogs and scorpions.

Other breeders also use social media channels like video sharing sites and the popular WeChat smartphone app to advertise and sell pets.

Many of the animals are placed in cages, and then put inside cardboard boxes. ( JD.com )

Small animals, as opposed to puppies and kittens, are delivered by courier service just like any other package — even though it is illegal to transport a live animal in this way in China, and despite the risks to the animal's life.

Sugar gliders, a tiny marsupial familiar to many Australians, are one of the most popular exotic pets that can be bought online and delivered by post in China.

The online demand for gliders in China has increased in part due to the popular video sharing platform TikTok, where users have posted videos of their pets jumping off high ledges and gliding into their hands.

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But the safe delivery of small pets like gliders is not guaranteed, and some customers have posted negative reviews online claiming their new pet arrived dead in the box, or passed away within days of delivery.

"The deaths were a result of the long period in transit or they were thrown around during transportation," one pet vendor told the ABC.

The vendor, who declined to give his real name but uses the name Daosheng Pet Supplies Store on JD.com, tells his customers to film themselves opening their deliveries, in order to claim a refund if the animal inside has died.

An image submitted by a customer on JD.com, who said his hamsters' cage was crushed while in transit. ( JD.com )

He said he had also changed the way he mailed his animals — which include snow foxes, prairie dogs and peacocks — in order to reduce the risk of them dying in transit.

For instance, he no longer takes orders from areas far away from his base in China's southern Hunan province, and he puts the animals in cages placed inside cardboard boxes.

"At first, there may have been some cases where the death rate was high, but now basically there is no death," the vendor said.

'Completely unacceptable'

Sorry, this video has expired Footage from Chinese video sharing and e-commerce sites, showing how some animals are mailed.

Bronwyn Orr, a veterinarian who is also the RSPCA's scientific officer on companion animal issues, said delivering pets through the post was "completely unacceptable".

"Obviously animals are sentient, they experience pain, fear and distress just like humans do," Dr Orr said.

"It would be difficult to breathe, difficult to thermoregulate, and it doesn't look like they have any water."

Beyond the risk of death from this mode of transportation, the animals could face lifelong psychological damage.

"It's one thing that you might be able to get an animal to survive a journey like that, it's a whole other thing to say it hasn't been affected by it … mentally, that animal would be very stressed out " Dr Orr said.

A customer-submitted image from JD.com, posted by a buyer who said they received a dead bird. ( JD.com )

China's postal law states it is forbidden to post and deliver live animals, or insert them into postal materials.

However, customer-submitted photos posted on JD.com indicate that several major Chinese courier companies, including Yunda, ZTO and YTO, have been transporting parcels containing pets.

The ABC approached those three companies for comment but did not receive a response prior to publication.

In a statement, a JD.com spokesperson said the company was aware of concerns about the transportation of pets through its platform, and was looking into the issue.

"While all merchants on JD.com are required to be licensed and to operate in accordance with Chinese regulations, the company is looking into the standards of its merchants and their carriers in relation to the sourcing and transportation of pets," the spokesperson said.

Taobao, which is owned by Chinese e-commerce giant Alibaba, was also approached for comment.

Pets delivered in Australia too — but not in the post

Australians are also increasingly looking for and buying pets online, but they cannot be mailed in the post.

Classifieds website Gumtree hosts thousands of listings for pets, with some breeders also offering to organise delivery for puppies and kittens, sometimes through the use of pet transportation companies.

eBay does not allow live animals to be listed on its site, and Facebook has also banned live animals on its Marketplace feature — but there are still plenty of pages and groups on the site where animals are advertised, with some also offering delivery.

But Dr Orr warned against choosing to have a puppy or kitten delivered, which can make it harder for new owners to know the animal did not come from a puppy farm, or whether the sale is a scam.

"Sometimes people forget that animals are not the same as any other commercial goods … the circumstances they're raised in directly impacts their long-term health and welfare and state of mind," she said.

"Convenience is a great thing if you want to buy cheap clothes online, but I think we have to be really careful how we trade pets online, to make sure that convenience doesn't compromise their welfare."

The RSPCA is today releasing new guidelines for the online advertising of pets, which are aimed at helping retailers better protect animals in line with the expectations of customers.

They include a range of requirements for those looking to sell animals online, as well as new due diligence measures for websites.

Red flags to look out for online: If the seller is offering a puppy or kitten that is less than eight weeks old , they shouldn't be trusted: "The animal won't be fully weaned yet, or properly socialised," Dr Orr said.

If the seller is offering a puppy or kitten that is , they shouldn't be trusted: "The animal won't be fully weaned yet, or properly socialised," Dr Orr said. If the seller says they "can arrange transportation", that's another warning sign: "They probably don't want you to come and see where the animal was bred, and that could be because they have really poor conditions, or they're a puppy farmer, or all sorts of reasons."

Some of those measures would require site owners to audit advertisements for blacklisted words like "dog fighting", and display a "report animal welfare concern" button on all animal advertisements.

"Unfortunately no online retailer in Australia currently complies with our guidelines, so that's everyone including Gumtree, Trading Post, Facebook and Instagram," Dr Orr said.

"That's a bit of a disappointment, seeing as we have been working with industry on them, but we are hopeful that the online retailers will choose to comply.

"For some of these retailers, the pets category is one of their highest traffic areas … but they have a responsibility at the same time to make sure that those animals are safe, and they're not put in danger by being sold online."

In a statement, a Gumtree spokesperson said animal welfare is a top priority and the website has worked with the community and animal welfare agencies to improve its pets category over the past few years.

"Our commitment to animal welfare was also the reason why Gumtree actively worked with the RSPCA earlier this year to help develop their new guidelines for the online advertising of pets," the spokesperson said.

"We currently meet the vast majority of the requirements and will continue to roll out improvements to the category."