He got into someone's yard in the neighborhood across the street.

The article states that the dog was removed for someone's back yard... Why is animal control going into someones back yard to remove a dog?

This is my dog, his name is Stewey. He ran away from home when my little boy let him out last Thursday night. He didnt have a collar on because he had just had a bath. We miss him a lot, we had been searching for him nonstop. I sent an email to the shelter Tuesday and that is when we found out that he had been there and been stolen. We have had him for 5 years and we want him back. If you know anything please let the police know. Thank you.