Found Shih Tzu

[Catherine]

If you have had the dog a reasonable number of days and no one has tried to find him, and he appears to be neglected, you can consider him dumped and available for adoption.

If the other dog doesn't like, him he would be better with the other people. It would always be a tension to live with another pet that doesn't warm up to you. It would make it harder for the people adopting him.
As an only dog he would be happy and they can always get a second dog if they want one(both families).

I bet he is really cute after grooming.