USA Per Express International Took wire money and requested more Philadelphia Pennsylvania

I was speaking with A family who stated they had a  French bulldog puppy that they needed to get rid of.  They said they would take the puppy to the "agency" and they would be in contact with me. I received and invoice for the transfer of ownership and ticket for travel. I wired the money. The agency said that they would send me all the flight information after I sent the money. Instead of getting flight information I got another bill for $400 saying it was for a temperature controlled crate that is mandatory for this travel. I was able to talk to someone and they have a very heavy Russian accent and I believe it is a scam. They no longer will answer their phones or return emails.  I have requested several times for their business location (address) and they will not give it to me.  The thing that made me realize it was a scam was they provided a different wire account from the first time.