When my girlfriend and I moved in together we decided to get a dog. When the dog was purchased it was done so in her name and she paid for him as well. I paid for all of the vet bills and the vet account lists the both of us as owners. The relationship has ended and she came to my current residence and took the dog while I was at work claiming that it is her dog because she paid for him. Do I have any legal right to fight for the ownership of the dog?