just cos a person has a larger dog shouldnt mean they cant have a yorkie. but it would be ok if the person already had a yorkie? two terriers together is a lot more deadly than one small dog and one big dog, normaly the small dog is top dog but with two yorkies it can become a blood bath.these little dogs you talk about that are so delicate where used to KILL rats and where also used to fight each other sometimes to there death, i had a problem with 2 of my yorkies fighting a couple of years ago and believe me id rather get between 2 big dogs fighting.if the point is a yorkie shouldnt be rehomed with someone who has a dog that could kill the rescue yorkie then the rescue yorkie shouldnt be rehomed with anyone who has a dog of any size? as its possible of any sized dog to kill it, or maybe they shouldnt have the yorkie if they have a cat thats bigger? stairs? well they might fall, maybe just to be on the safe side the rescue yorkie should go to a home with no DOGS CATS or STAIRS and be carried around all day in a box filled with cotton wool? as i already said the only things the rescue home should consider is will the dog be cared for? if the person has a dog already. do they all get on? if they have kids, how do they handle the dog? have they the money for vet bills? is this person gonna love this dog for the rest of its life? if you then pass all that then you can take the dog.