I have a 5 yr old neutered male yorkie(Timba) and then I got my 4 month old girl yorkie(Maggie) ... at first Timba was very bothered by her for awhile I say about a couple of months maybe 2 or 3 months went by now they are starting to get along better.. it takes time for them to adjust.... I guess Timba realized that she wasn't going no where.. so I might as well get used to her.... they are starting to sleep next to each other now.. little by little but she likes to annoy him.. I guess cause she is the baby still.....
