Hello I'm after some advice for my mum , she has a 3 year male cockapoo (intact), who has all of a sudden turned aggressive in the home with herself and her husband , they are having to keep him on a lead at all times. He is not being aggressive at any specific time , it is just at random times. He was sick last week and since then has become aggressive, growling , barking, biting, moving very slowly at times and turning and looking & snarling. He has been to the vets and blood tests are clear but they recommended a MRI scan which he is booked in for on Monday , the vet said if this comes back clear then she recommends having him put to sleep , which is devastating for them! Nothing has changed in his home life etc , he has been trained since a puppy and still visits the dog trainer regularly! He has always been a very loving dog so for him to change over night , seems very strange.