Is my dog legally allowed to attack anyone who tries to break into my home?

I have a rottweiler and he is as friendly as anything and would never hurt anyone but his gaurd dog instincts have started to kick in recently, I'm just wondering what would happen if someone tried to break into my home whilst we were sleeping and he seen that person as a threat? Would it be legal or would he... show more I have a rottweiler and he is as friendly as anything and would never hurt anyone but his gaurd dog instincts have started to kick in recently, I'm just wondering what would happen if someone tried to break into my home whilst we were sleeping and he seen that person as a threat? Would it be legal or would he be put down? I know I'm the UK you're allowed to use self defence if someone breaks in but I don't know about dogs?
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