This is always a difficult one - are there any board members in your area? [I can't remember where you are now?]
I have had this happen recently to a friend, fortunately her friends rallied round and looked after her dogs whilst she was in hospital for 2 weeks.
There is an organisation for Scotland
http://www.pfss.org.uk/page17.html
but also worth trying
http://www.cinnamon.org.uk/home.html
I think it is worth arranging with a neighbour to take the dog in temporarily, also leave a note with them and in a prominent place in your home, saying whom to contact in this situation.
If your dog is on medication, write out what they are taking and when and put that on your fridge, also what food they are having, routines etc - you can direct people to this in your other notes, then you only have to keep the fridge up to date!
I also have a note in the car addressed to emergency services saying that I have dogs at home and whom to contact.
It's better to think of these things in advance and be prepared - sadly also recently a friend on TRPD passed away suddenly, leaving horses, dogs and poultry...fortunately arrangements were in place for their temporary care and permanent care is being sorted out.
We should all plan ahead - sadly these things DO happen.
The other thing I would recommend to EVERYONE is to enter a number in their mobile phone's memory under the heading ICE, standing for "in case of emergency".Paramedics or police would quickly be able to find the number and use it to contact a relative or friend who could identify the victim and give vital information such as details of any medical conditions.