It is exactly the same product. We ship them from a country (Australia or Singapore) where these products are over the counter products.

Yes you can buy this without a prescription.

Yes, for your small dog you can buy this: https://es.petbucket.com/p/9436936/simparica-trio-for-dogs-28-55-lbs-125-25-kg---6-pack.html and for the other one this: https://es.petbucket.com/p/9436941/simparica-trio-for-dogs-111-22-lbs-5-10-kg---6-pack.html

We would advise consulting with your local vet to advise which medication would be best suited for your dogs needs.

If your dog weights 70 - 75 lbs, then this is the correct product.