Planning a cross-country road trip with a dog

No. Dogs are predators, as well as scavengers, and so their bodies have evolved over many thousands of years to thrive on raw meat (kills), carrion, and a bit of vegetation (berries, grass, stomach content of prey). Bacteria is in both prey and carrion. Their saliva has antibacterial qualities to it to deal with this problem.Which is why letting them lick wounds, providing they don't overdo or can pull out stitches, is a good idea, and a natural instinct for them.

Their digestive tracts are short, unlike ours, which are very long. This is to help their bodies get the nutrients out of their food, without keeping any remaining bacteria inside any longer than necessary.

Aside from dogs being given or scavenging cooked remains by and from humans, cooked food isn't part of their natural diet. It wasn't this way until the past 70 or so years, to the point where that's all most dogs get and, as a culture, we consider it weird, unhealthy, or just icky, to feed them what their bodies were designed to thrive on.

I once asked my vet if he heard of a person who lived on canned and packaged food, would he think that person had a healthy diet? He was a good man, cared about animals, but was very entrenched in the traditional medicine he'd been trained in, and obviously never gave any thought to anything else. He grew thoughtful and quiet, and then said "No."

You might find this link helpful:

http://www.healthguidance.org/entry/15230/1/Raw-Chicken-for-Dogs.html

I know you said you've got a large, hungry dog, and it'd be very expensive to feed him anything but kibble, but my dog is 70 lbs. I buy a package of 6 drumsticks from Trader Joe's for under $4, or a larger pack from grocery store when it's on sale, and that lasts her for 6 meals, plus some high quality non-corn, wheat, or soy kibble (also from Trader Joe's and about $20 for 20 lbs), with a bit of cooked veggies.

IMPORTANT CAVEAT coming up next. Out of space.

If I recall correctly the leptospirosis vaccine is the one vaccine out of the 7 in 1 injection my vet decided not to give to my yorkies (they are terriers). It made them ill. He said they were too tiny and did not need it. So, from then on it was the 6 in 1 injection. In our FL county when the pet received the rabies vaccine it was reported to the county. We were then required to get a health certificate. I was warned the county would come calling if I didn't. I never got one and hoped the county had better things to do than coming to my house to give me a fine. They never came. Why would they? It didn't make sense; they knew the dog had rcvd the rabies vaccine! As for the heartworms I agree with him. Too many unknowables. Who would think my husband got the Lyme disease in Florida, apparently from a northern dog carrying the tick?