Next door's lovely cat (male,not neutered,about 14m old) has just started killing off the birds in my garden.I have a dog who has previously chased all cats away,so the birds are used to being safe,and I have bird feeders etc.I love my birdies! My dog and ND's cat are friends so he is in our garden a lot,also they don't have a cat flap and he likes to cosy down in our shed,or our conservatory,when ND is at work. Today he killed a robin in fron of my horrified and upset small daughter,what can be done? Do bells work? will I seem a right old bossy boots if I buy ND a collar for the cat with a bell? All the birds are nesting now,we have full nesting boxes,and he has killed two blue tits,the robin,a collared dove and another bird this week alone.It is horrible,any ideas?