You should be able to deny them for safety issues such as no restraint. No one wants a 40 lb projectile flying into the back of your neck in a accident. I find many people with service dogs as the worst people on this planet. They ruin it for the truly disabled.
Old but interesting article about unrestrained dogs and safety.
http://latimesblogs.latimes.com/unleashed/2011/01/dog-car-travel-safety.html
Experts warn about the dangers of driving with unrestrained pets in the car
Man's best friend is not a driver's best friend.
While lawmakers have been banning drivers from texting or using cellphones, many motorists are riding around with another dangerous risk -- their dogs.
Experts say an unrestrained dog -- whether curled up on a lap, hanging out the window or resting its paws on the steering wheel -- can be deadly. Tens of thousands of car accidents are believed caused every year by unrestrained pets, though no one has solid numbers.
"An unrestrained pet can be hugely distracting -- if he is seeking your attention, putting his face right in front of yours, starts chewing up the upholstery or is vomiting because he is carsick," said Katherine Miller, director of applied science and research for the American Society for the Prevention of Cruelty to Animals.
The issue is drawing attention in some statehouses. Hawaii is the only state that specifically forbids drivers from operating a vehicle with a pet on their lap. But Oregon lawmakers are considering fining drivers who hold their pets behind the wheel. And some cities are taking action, too.
In 2009, 5,474 people were killed and 448,000 injured in crashes caused by distracted drivers in the United States, according to the National Highway Traffic Safety Administration.
Cellphones were the top distraction -- the cause of 18 percent of the fatalities and 5 percent of the injury crashes. The agency does not track accidents caused by pets, but said they are counted among other distractions such as disruptive passengers, misbehaving children or drivers who attempt to put on makeup or read.
Author Stephen King suffered several broken bones and a collapsed lung in 1999 when he was hit by a driver who claimed he was distracted by his dog.
In a crash, an unrestrained pet can turn into a deadly projectile or get crushed by a driver or passenger who is thrown forward by the collision.
Good pet owners will use a harness or carrier and secure their pets in the middle of the back seat, Miller said. That keeps dogs from getting hurt or bouncing around and hurting others.
"A pet that weighs 50 pounds, in a 35 mph collision, is projected forward like a cannonball with 1,500 pounds of force, and that can cause critical injuries to the folks in the front seat," Miller said.
Restraining a pet also keeps the animal from running off after a crash and possibly getting hit or causing another crash, or from getting in the way of first responders, she said.
Susan Footh, 37, of Whitewood, S.D., said her 12-pound Maltese named Mozart could have been killed twice if he hadn't been wearing a harness.
Footh was on her way to a Christmas gathering when her car veered out of control on ice. She smashed into a highway barrier three times before the vehicle stopped. Presents flew through the car, her coffee splattered all over the back window. But Mozart stayed put.
Then, a few weeks ago, another driver clipped her bumper while trying to pass, sending her first into a spin and then into a ditch.
"Mozart was shaking. I'm sure he was saying, 'Not again,'" Footh said. She was able to put the car into four-wheel-drive and climb out of the ditch.
In Oregon, lawmakers will vote in the next few months on a bill that proposes a $90 fine for people who drive with an animal on their lap.
A similar law made it to the governor's desk in California in 2008, but then-Gov. Arnold Schwarzenegger refused to sign it, saying it was not a high priority.
Bill Pace, the former assemblyman from Visalia who introduced the failed bill, said he frequently sees drivers with "animals up in their face, in their lap and on the steering wheel. ... This is not a rare occurrence."
Some cities have passed laws of their own. In Troy, Mich., a law took effect Jan. 1 that makes it illegal to drive with a pet in your lap.
But Jonathan Adkins, communications director for the Governors Highway Safety Assn., doubts that many states will single out pets.
Elected officials "can't have a law to outlaw every bad driver behavior," he said. "You go after the big ones."
But Adkins said the problem is underreported because the only way to know that a pet was at fault is if the driver says so.
Education about pet restraints will have to come from pet owners, vets, animal-welfare agencies and insurance companies, he added. And that could take years, just as it took a long time to get people to wear seat belts.
For pet owners, Footh said, the answer is easy.
It takes no more than 10 seconds for her to hook Mozart into his $12 harness. He helps by hopping up on the seat and waiting for her to snap it.
"My dog is my baby. I want him to live a long and healthy life," she said. "It's not just about feeding him and loving him. It's about keeping him safe in every way, and that includes when we are in the car."
