Some dog breeds are more prone to snoring than others. Breeds with short noses, such as Pugs and Bulldogs, are more likely to snore because their airways are narrower.
Overweight dogs are more likely to snore because they have extra tissue in their throats.
Allergies can cause inflammation in the airways, which can lead to snoring.
Upper respiratory infections, such as kennel cough, can also cause snoring.
Sleep apnea is a serious condition in which breathing stops and starts during sleep. It can cause snoring, as well as other symptoms such as gasping and choking.
If your dog's snoring is mild and does not seem to be bothering them, there is probably no need to worry.
If your dog has allergies, talk to your veterinarian about treatment options.