Duct tape, a pocket knife, twist tie trash bags, zip locks, and a Sharpie. Extra food, water, leashes, collars, halters and lead ropes are indispensable. Double everything you think you need then double it again. In emergencies, worried about your animals worrying? We have proven ideas!
One cat I was tending was so aggressive that the vacationing owners put a wall between 2 cages so I could put feed and water in one cage while the cat was locked in the other. ...sprays worked like magic.