Adopting Dog help

My ass of an older brother dropped of his ex’s dog that he was planning to euthanize. She’s a 4 year old husky she belonged to my brothers ex but she is no longer in the Untied States. How do I adopt her and get her spayed? I don’t want to show up to a vet with a husky that doesn’t belong to me I feel like I’m going to get accused of stealing her.

Sorry for bad English not my favorite language.