How to claim a dog as my own since I have taken care of it when its owner has abandoned it?

I had a partner who acts as a bipolar. Since h? Frequently left me? f and his own dog? R of the last? Re p? Period of one year, and I took care of the dog, then I r? Proclaim the dog like mine and how? Properties? Silence of socially Danke.Der? Favorites? Es and I t? r? recently, including assistance in esp? these? invoices v t? veterinarian, but he insisted? on the use of its v t? old veterinarian. Unfortunately I can not prove it with receipts may, unless the medicines last heartworm? Res are k?, Dog and.