Jaxon has been going out with my wife and I in the jeep since we "ordered" him as a puppy, and picked him up at two months old. In fact, the day we picked him up from the breeder (hate that word), we did so in the jeep. I just remembered that fact! His very first ride was in the jeep! Ha.Sorry to hear about that. Jaxon's first off road trip ever or his first in that Jeep? How old is he? Maybe he just needs some extra training to keep him calmer while off roading (and while sitting on your brother's lap).
Early on we had problems with Greta not wanting to be anywhere near any vehicle. Once we were able to get her in, she had to be on someone's lap no matter what. With the top off I tried putting her in my TJ while I was building a platform for her to ride on. She hated it and wanted to jump out, luckily she realized it was too high to jump from.
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I put her in the back of my parked Ram 1500 and she wanted to jump over the side of the bed to get out. The way I fixed this was "leashing" her to the TJ passenger seat, taking the doors off and driving a half a mile or so in my neighborhood. Later that day we went a little farther. We stepped it up a couple times and the next thing I knew she was sitting on my shoulders like Jaxon in your picture. Here we are at a stop sign.
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She's been off roading with me a couple times and we've had no problems. Maybe that's just because the windows were removed each time. She's not exactly terrible, but not so good in enclosed vehicles.
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Our random peeing issue happens when she is over exited to see anybody or anything with a heartbeat. We've got her considerably better with the peeing (it's been a few weeks) and somewhat better about being over excited. We're still hoping for the best of both.
Anyway, he's been riding forest trails and "light duty" trails, as that's all my heap was capable of until the "big build".
Now, going out into real 4WD territory (places my jeep would not go) has proven to be quite a bit different ride quality than before. All of a sudden, it's like we're on choppy waters in a lil boat, or some such. Just really crazy bouncing back and forth, and I think that made him car sick. Not even sure if dogs get car sick, but I'm pretty certain he did.