15 Weird Pet Trends You Have to See to Believe

We've all seen little dogs dressed up in adorable little sweaters and the like during the winter, but manufacturers such as Pet-a-Pawter have taken this phenomenon to stylish new levels with such offerings as Harris tweed dog coats and matching collars.

For a seasonal spin, check out 75 pets rocking the coolest Halloween costumes.

Just as apps such as Homeaway and Airbnb have changed the way we travel, the same holds true for pets. For proof, look no further than Dog Vacay, an app that's sort of like an Airbnb for dogs, which hooks you up with a network of pet-sitters, dog-walkers and the like wherever you and your pooch happen to be visiting.

See more: the smartest Airbnb hacks that all hosts and guests should know.

There are meal replacement bars for busy humans on the go, so why not meal replacement bars for dogs? That was apparently the thinking that led to the Out Bar from The Great Outdogs. Available in three flavours — turkey, lamb and herring — Out Bars are "complete and balanced meal replacement bars made with real animal protein and added vitamins and minerals," with the product designed to be "so nutrient dense that it is small enough to take with you on the go." The bars are recommended for when your dog accompanies you on such activities as camping, hiking or skiing, or as a quick fix for those times when you forget that you've run out dog food.

More pics: 14 ways your pets are making you healthier.

Forget Snoopy's doghouse — architect Kenya Hara has envisioned household objects that are designed to be on a dog's scale, not a human's, and spearheaded the "Architecture for Dogs" project, in which he and other architects created various items on a scale specifically for dogs. "Dogs are people’s partners, living right beside them, but they are also animals that humans, through crossbreeding, have created in multitudes of breeds," explains Hara. "Re-examining these close partners with fresh eyes may be a chance to reexamine both human beings themselves and the natural environment."

Related: 14 things pet owners never do (but definitely should).

Millions of humans swear by the healing powers of aromatherapy, and companies such as The Blissful Dog market special aromatherapy oils, while Leravan sells an aromatherapy air purifier for pets.

Is your dog an over-the-top diva? These 25 pups are too.

Audiobook purveyor Audible.com has partnered with Dog Whisperer star Cesar Millan for a line of audiobooks designed specifically to be listened to by canines. Among the titles available are The Art of Racing in the Rain by Garth Stein, Born a Crime: Stories From a South African Childhood by The Daily Show host Trevor Noah and — because, why not?

Do you have a wrinkly shar-pei in dire need of a facelift? How about a chubby collie who could use a tummy tuck? Don't laugh, because plastic surgery for pets is becoming a booming business, with typical operations including liposuction, breast lifts, nose jobs and a special procedure that stiffens ears.

Looking to go under the knife as well? Check out these 11 plastic surgery trends that are all the rage.

Believe it or not, there is actually a beer made for and marketed to dogs. Bowser beer is made from human-grade meat, barley and some added glucosamine for joint health. "Pet owners have discovered that they can pour it over kibble for their pickiest eaters," declares the Bowser website. "Creative customers freeze it into beer popsicles or pair it with doggie ice cream and watch their dogs enjoy a cool treat." Apparently cats like it too!

For more laughs, see what happens when celebrities mix drinking and tweeting.

Humans substitute treadmills for actual outdoor walking, and now our four-legged friends can do the same thing. Fit Fur Life treadmills will keep your dog fit and trim, even when the weather is too miserable for a long walk.

You reach for a pair of sunglasses when you head outside on a sunny day — why shouldn't your dog? That's the thinking behind Doggles, a line of sunglasses designed just for canines, with an array of designs and lens colours available for the discerning doggy.

More pics: pets rocking the latest fashion trends.

What pampered pooch wouldn't enjoy having colourful claws at the end of their paws? With that in mind, fashionable dogs are sporting OPI's PAWlish, a line of nail polish that's been formulated for dogs and cats who'd rather look stylish than maintain their dignity.

Remember the days when it was considered a bad thing for dogs to grab food from the table? That old rule is out the window when Rover is invited to sit at the table with you, thanks to specially designed doggy high chairs that allow your dog to dine in style right along with you. Pass the kibble, these pets are pampered enough to be on The Real Housewives.

If you have a male dog that is constantly humping furniture, houseguests' legs, stuffed animals or whatever happens to be lying around, then he probably needs a Hot Doll, the first sex toy for dogs. The purpose: when overcome by the urge, a dog can be trained to enjoy "sexytime" with his doll, and not your shin. However, the manufacturer's website does include a warning: "Consult a veterinarian if your animal uses the Hot Doll intensively."

While the idea of taking out insurance on your pets may seem strange, it's actually an idea that's gaining popularity; many mainstream insurance companies, in fact, allow you to take out policies on pets. Pet insurance pays off if/when your animal is in need of expensive veterinary care or an operation that could otherwise cost thousands of dollars.

See more: the most expensive dog breeds you can own.

If you're a responsible pet owner, you've likely had your dogs and cats spayed or neutered. However, a new trend has emerged based on the theory that a neutered animal misses what's been taken away, which has led to the invention of "neuticles" — artificial dog testicles to replace the ones your veterinarian snipped off. Kim Kardashian picked up a pair for her dog because, well, have you seen/ that show?