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Yes they have a snack bar and drink bottle but they don't show them eating on TV.
by eating
With my guinea pigs, I waited until they stopped drinks their mothers milk completely and started eating and drinking regular food
Although water is the best way to stay hydrated, there are other methods which will work almost as well. There are sports drinks such as Gatorade, but they can do more harm than good. try eating watermelon or cucumbers before running. both of these fruits are high in water content
take it to the vet
eating
Yes by moving them with out eating them
No you shouldn't starve yourself.
Our 14 year old Golden Retriever reduced/stopped eating over a period of 4 days and then stopped drinking 24hrs before she died.
We fed my pup cucumber (with skins) and whatever was in the taste it stopped him eating poop!
He stopped eating.
Call your vet and get the dog examined.