I have no problems with travel with my Bully's. Rocky and Rambo wear a harness, That I found at Pet Smart, that is a step in Harness, and is very comfortable, It also snaps together on their back, and has the two "D" rings on top of the clasp that holds the harness together just in case the plastic snap were to break, Here is a picture of it…
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Then I went to Amazon, and I ordered a Pet Safety restraint, It's a strap that fastens into the child car seat restraint in your back seat, You should have four (4) of them in your back seat, The other end fastens to your pet….. Here is a Picture of it….
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This safety restraint comes in different lengths, and is adjustable. Recently, I traveled from Lake City FL to New Orleans LA with my Bully. I set the restraint long enough to allow his movement in the rear seat, to sit, Lay or stand, and even jump up on the seat and look out the back window, But also short enough to keep him from jumping across the center console into the front seat. Both my Bullys are clumsy on car rides. Rambo and Rocky will fall over in the seat when I turn, They will fall to the floor board from the seat when I hit the brakes. I am a safe driver, They just are not car steady. They both use the restraint to balance themselves, Which allows for a much better ride for them. The restraint is also made as a safety seat belt in case of a collision. At a low speed or city accident, I have no doubt my Bully would be safe, using this restraint, at High speeds, it's a gamble for anyones survival. Also, Pet Smart and probably Amazon, sells a seat cover, That covers your back seat, personally, my seats are cloth, which allows my kids to grip and hold on better. Another helpful tip, Get a plastic water bottle fill it with water and chill, Teach your bully to drink from the bottle, Slow, small amounts, no mess, This way in transit, if he does get anxious, or warm, you can always cool him down with chilled water. The last thing I do, is keep an ice chest in my back seat floor board, filled with Ice, Drinks for me and my boys, Both love ice cubes, So thats an added treat to travel. When we go outside for walk time, They both head straight to my truck, wanting to go ride. The last thing I'll add, is I don't use a crate to transport either in travel, My thought is the bottom tray is plastic, No grip for their claws, and footing would be poor at best, Hitting your brakes in a hurry, would seem to be a nightmare, and it seems to me, may cause injury, sliding into the cage walls. The last thing to say is there are Rest Areas with security about 30 minutes apart from one another. Each of these rest areas have an area to walk your pet, marked off. Traveling with your pet is simple and easy, safety and common sense in mind, I have no fear traveling anywhere by car with mine, wouldn't hesitate one minute over it. Also, There are plenty of Pet Friendly Hotels, So if your traveling further than a one day drive, Just do a little planning ahead of time. My Boys love car rides, and trips…. They can't get enough of it. If you have any questions or anything I haven't covered, please feel free to ask.