Thankyou all for your comments. The vet suggested that we increase one of her tablets in order to drain water from her lungs and to monitor her over the next day or so. So far, she has only coughed once since around 10am this morning (as opposed to constantly last night) and is currently asleep. Thankyou all again for your kind comments as this is such a difficult time for us and the mean a lot.
Oh dear sweet Boos. Dear Mickeylees, our thoughts and prayers are with you. May God bless you and give you strength and comfort. I'm so very very sorry. Love you.
This could be the last picture that we submit of Boos as I have been by her side all night as her breathing rate has increased and she is coughing and doing little else. We will be visiting the vet when he opens, but we are preparing ourselves for the worse.