I have a ten years old Chihuahua (I know, it's more of a middle-aged dog!), we adopted him together with my sister about a year ago: he was in a very distressful situation when his owner (a truly old lady) died, and he needed a place to stay. Since then, he's been living with me, but I had an agreement with my sister (a vet!): every time I have to go away for a while, she keeps him. He seems to be absolutely fine about it (I sometimes have to travel for one or two weeks), but now something has come up: I have to leave the country for 15 months because of my work. Therefore, she's going to keep him, but she's stressing out that as soon as I come back I should get him back. I'm going to come back and see him as often as I can while I'm away (about twice a month), but I'm wondering if this situation in all right with him. Should I convince my sister to adopt him?
Thank you very much for reading!!