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Dogs are naturally owner protective. ICE agents have a job to do. Dogs will attack anyone threating their owners and ICE is threatening their owners.
How would you deal with a dog that is attacking you? If you have dogs, are you immune from being deproted?
Well I have dogs, I love my dogs, but if I were being arrested and the officer only kicked my dog (did not shoot it) I would be pretty happy my dog was still alive.
I also have inlaws that have a 150lb dog that would kill me if I get in the yard with it. Any time I am around it, need to go in their yard, I make sure I am armed and am fully ready to kill it if it comes at me. And guess what? My wife who loves dogs more than me, has told me I will go before her dogs will go, would thank me for killing that dog because it it a menace to everyone but its owners.
tldr: No one likes seeing a dog get hurt, but you need a reality check if you think they can not be a threat to people threating their owners.