Help please- older rescue peeing in house

[Marie-France]

Hello all,

We just rescued a small Bichon X poodle from the SPCA Montreal. They were going to euthanize it, so we brought it home yeasterday after a visit to the vet. The vet said he is about 8 years old, has cataracs and is not neutered. He would have some minor heart problem as well as kidneys. (I know what they are in French, not in English, sorry !) So far, he is doing good, except that he pees everywhere in the house all the time (marking his new territory?) We already have 2 dogs, 1 male and 1 female. Because of his heart condition I am hesitating having him neutered because of anesthesia. Is there anything else we could try before?

Thanks for your help !

Marie-France