Anticipate nature's calls. For a cat a litter box is basic gear for a road trip. Take a dog on a short stroll on a leash at least twice a day. Carry disposable bags and a scooper to use in public parks, cities, motel properties and beaches. Prepare for health problems that are common to most travelers.
Constipation can plague traveling pets.
It can be caused by lack of exercise or water, infrequent stops or anxiety about strange new territories. Temporary constipation is not a serious problem and will usually clear up before long. For a dog you can prepare a useful preventive with figs, prunes and raisins as well as fresh berries or other fruits in season. Bran or psyllium husks are also helpful. Nausea grips some animals when they ride in a car or plane, and they will either vomit or salivate excessively.