I have a degree in Veterinary Technology and when I went to school we had stray/rescue animals we cared for in the clinic. Every time there was a cat or dog someone else didn't want to take home I had to really force myself to walk away and it was really hard. I thought about working in a shelter, but no way that would end well. I ended up with one stray cat from the school. I also inherited a dog that was abused and growls at everything and a deaf dog. Thankfully, someone with more time and energy took the deaf dog because I had my hands full and he is doing well. I think it is a combination of poor boundary setting combined with a tender heart, but that's just me.