The OP came to the litigation forum asking legal questions. I gave him is LEGAL options. The police DEFINITELY need to be contacted, as something was stolen...I don't think this is about money. Suing for the value of the dog is not going to get the dog back safely. You have to approach this in a reasonable fashion. Be reasonable with the people who stole the dog. Let them know that their actions are in fact illegal and that you will pursue this if the dog is not returned. Let them know that you have documents to prove that the dog is in fact yours....vet bills, adoption paperwork, photos, etc. Keep the safety of the dog as 1st priority.
The police are there to deal with stolen stuff...it's kinda their job.Do the police want to be bothered by a stolen dog? You should try to work things out on your own first. The police will help you when you can't do it yourself. Would you call 911 for a sprained ankle? If my neighbor stole my guitar, I would approach them before the police were involved. You don't want to be the whiny neighbor and end up on Dr. Phil.