If your local council finds your dog, they will often return it to you without issuing a charge. However, this will only be possible if it is tattooed, is wearing a tag or is micro-chipped.

If your council find a stray dog, and they cannot trace the owner, the dog will be taken to a dogs home, who will keep the dog at your expense. If you do not collect your dog within seven days, you may lose the right to reclaim it, and efforts will be made to re-home it. Directgov