Use the filtered search at Camping.se to find campsites that welcomes pets. Under General facilities choose Dogs welcome.
Pets are welcome at most campsites, however, there may be some accommodation objects that are adapted for allergy sufferers. Please check this before booking or in good time before your arrival by contacting the campsite directly.
Campsites generally provide information about pets under ‘read more’ for the accommodation object or under ‘facilities’. If you don't find information about the accommodation object you want, make it a habit to always make a note that you will bring a pet in a message to the campsite. Then the campsite has the chance to place you in an appropriate accommodation object or get back to you if they don't accept it.
You can also contact the campsite directly by telephone or email for information if you have questions regarding this.