Alex Kindred, car insurance expert at Confused.com said it was “important” that animals were properly restrained on a journey.
They warned hotter weather temperature and long journeys could leave animals feeling “distressed” while inside a car.
He said: “Staycations are giving us Brits the perfect opportunity to get away this year, and for some this means enjoying a nice break with our pets.
“But it’s important that animals are properly restrained while travelling otherwise you can run the risk of invalidating your insurance or being slapped with a hefty fine.
Section 56 of the Highway Code warns road users should not let a dog out on the side of a road on its own and should keep it on a short lead at all times.
Removing your pet due to a car breakdown could see road users incur penalties of up to £2,500 and six penalty points on a driving licence.
Instead, road users should leave their pets inside a vehicle as they are less likely to distract other Drivers.
Liz Harrison, spokesperson at Caravan Guard warned the distraction pets can cause could be “catastrophic” when travelling at high speeds.
She warned road users needed to take “extra precautions” when they decide to go on holiday with their animals to avoid any consequences.
She said: “If you’re unfortunate enough to break down make sure you think twice before taking your pet out of the vehicle as it’s not always the safest thing for you, them and other motorists.
“The distraction that animals can cause could be catastrophic when motorists are going at high speeds, so it’s important to take extra precautions when holidaying with pets.
“This includes making sure you have a suitable restraint, such as a harness, pet carrier or cage.”