Hello, I am from Tianjin, too. I know there are many rescue centers for stray animals in Tianjin at present. Generally, small animals can be adopted in Tianjin (Hebei and Hedong). However, the variety may be limited, the appearance will be worse than that of domestic pets, and some will have some physical disabilities.
But there is another way to adopt, that is, go to many websites, such as Tianjin pet net/Tianjin Jiji.com/58 Tongcheng.com, and check it out. There are free cats on it.