The other dog, and only pet we have is a male 3 year old Shih Tzu. Both are fixed. This is a very loving dog but from a well known breed famous for being stubborn. You Shih Tzu owners out there know what I mean. Any tips from you Shih Tzu owners? The two times the dogs met, they were OK with each other. How do you introduce another pet like this? House is 800 sq. ft with 1500 sq. ft. fenced backyard in rural/sub-urban neighborhood. The female dog was abandoned with other litter mates.