The long, pendulous ears on Cocker Spaniels are prone to ear infections if they are not cleaned on at least a weekly basis. Some Cocker Spaniels may need their ears cleaned 2-3 times per week. While playing with or brushing your Cocker Spaniel, lift the ear flap and sniff the ear. If it smells clean, it is healthy.
More importantly, though, Grand Canyon helicopters (West Rim AND South Rim) have a weight surcharge if a passenger weighs more than a specified limit. The weight limit is set by the tour operator, but it's usually either 275 or 300 pounds. So, as a general rule, passengers who weigh more than that will need to pay a weight surcharge before they're allowed to board their chopper. The amount of the surcharge is set by the tour company that's operating the flight.
So expect to see strict enforcement of the 70 mph speed limit there. Nevada is a desert so staying hydrated is a must. Summer temperatures in Las Vegas sometimes reach higher than 115 degrees. With that in mind, carry lots of water -- for you and your passengers as well as for your radiator in case of overheating.