I ve not been on the forum that long but i know a gentle soul when i meet one. I am glad that you decided to stay.
I am so sorry after reading what happened to your little friend. Sometimes parents dont seem to understand and anger is a reaction of panic. They just dont think clearly. My dad broke and threw out a couple of my favorite toys when i was 4 years old just to force me to understand a couple of things. Sometimes they think they failed in the upbringing of their children and hope by doing things over the edge will force us go with their waters.
Dont blame him for something he doesnt quite understand. He fears that since you spend more time with animals than humans that it will cause problems for you in the future and tries to prevent that. His intentions are not to cause you stress and sadness but he is trying to 'correct' a behavior by using horribly wrong means. And what he possibly thinks is his own failure. If only he knew that animals help people overcome their problems... Assuming there are any problems...
I will end this with my best wishes for you and an advice: Seek indeed some counsel about the subject, there are people in the social services that can help your father understand his errors.
And sorry for interfering to your life. Be happy.