Thanks everyone for their comments. There is no way I could leave my little doggie behind when I come over and he's a complete lapdog anyway so its not like he's going to be straying around the village streets on his own, he never leaves my side, he's a tiny little thing that lvoes nothing more than cuddles and being carried everywhere so am not worried about him being poisoned or anything nasty like that as he would always either be on a lead with me or in my garden.
Thanks for the info about the ferry, was going to try and smuggle him into our cabin (as someone said this could be done if the dog is small) but failing that will make sure we bring a padlock so that he is secure. Thanks for the info about Ibis hotels I have checked them out and they seem strategically placed along route so will make some reservations.
Although the house is going to be ready we are not going to travel in August as too hot and I know the ferries get jam packed with Italians amongst others so will leave it until September now.
Thanks everyone once again, will keep you update on how we get on.