Has anyone got experience of the best vacuum for a large long haired dog? (For the carpet not the dog). My upright Dyson, keeps getting clogged up. I'm having to dismantle it and clean the brush bar weekly. I'm getting fed up. Its nearly 20 years' old so I think I deserve a new one. If I buy an 'animal' will I still have the same problem? The 'shark' says it has no tangle on its brush bar. Is that true? The most highly rated model for pets is a cylinder type and I prefer an upright. Although I have a Dyson cylinder. I have also considered a 'Harry'