Original owner wants the dog that he surrendered.
Last week, we found a 16 week old puppy with health issues. We called the number on his collar, and the person stated that he did not want him anymore. The dog is registered in our household now, and has visited our vet already. Recently, the original owner said he regrets that he gave him away, and he is demanding that we give him back. Is there any legal action he can take to actually take him back? Can we fight it?