It’s worth mentioning at the outset that not every pet can be brought with you. For example, there are breeds of dog that are not allowed into the UK. There are also strict veterinary control requirements. It is necessary to chip the animal, issue a sanitary certificate with all vaccinations.
There are different conditions for transporting animals by air and by car (e.g. from France). In order to avoid a long quarantine period, pet owners are more likely to use the second option.