A silencer

Here is Lucy modelling her latest piece of jewellery!,
She is a lovely dog, but like many beagles, she barks a lot and once she starts ......
We've tried various things to try to discourage her - dog behaviourists, ( a waste of £200), a sonic thing etc. ( we didn't fancy an electric shock thing)
Someone suggested this.
If she barks, it gives out a puff of citronella which most dogs don't like.
We only put it on her when she is likely to bark and it is very light.
And it works!!
Our vet says it is okay
I think it would be a good idea if a certain American businessman/politician had one of these as far too often when he opens his big mouth, he says something offensive or very offensive!!!! 
And here are some more Silencers