Two young french people with a dog, looking for a flat in Santander for 3 months

We are two young french people who have get an internship in the University of Cantabria, Santander. We are looking for a flat during our 3-month stay in Santander, that accept animals. We have a 12kg dog, 42cm height, that is regularly trained (clean, not aggressive, used to stay at home during the week, our neighbors never complained about it !). She's a bit timid, but very friendly once the first step has been overcome !