Generally, a round collar is suitable for long-haired dogs, and it seems that there is less damage to the coat due to friction with the collar compared to a flat collar.
In addition, it is recommended to replace the collar as soon as possible because it takes about 6 months to replace the collar and it depends on the usage conditions. Check it once a month.
Please prioritize the selection of collars according to your weight.
With Petio, you can find the fashionable and cute collars you want to recommend.

This is mainlyCollar for medium-sized dogs from 15 to 20 kg | CollarCategory.