Get your puppy used to travel by car from he/she is quite small, so it does not make the puppy anxiously.
Be well prepared for the travel - it will make your travel more enjoyable both for you and your dog.
Here are a few tips on how to train and travel with a dog.

Heat can be very dangerous for dogs. Read how to keep a dog cool and avoid heat stress/stroke in the summer.

Chihuahuas, Griffons and small dog breeds in general tend to have a longer lifespan than larger dogs. Their life expectancy has been known to range between 10 – 16 years.