Can I turn this around for you a little bit perhaps...
Am I reading it right that basically he will leave you with nothing should you leave - that is the house and finances are in his name completely?
If they are then in my book that could be excellent news...
(Bear with me)
Forgetting for a moment what you have contributed and are entitled to should you leave him with the children then is it not possible to leave and set up very basically on your own in rented?
2-3 of my friends have divorced and done this - basically walked away from the family home leaving their DH to have the house for themselves... what I have noticed is that it makes them much much less vulnerable than had they had stayed in the family home.
As they have gone through the divorces the finances have been sorted but for that period when they left they did not rely on their ex for anything.
Only one of them was not working - though she is a carer for her disabled child.
You will not have the lifestyle you had, you will have to skimp and save BUT you are now... it just feels scary because you dont have someone to potentially bail you if needs be... though realistically would he if there was a problem even how things are?
I have been a single mum for all the time I have been a mum. I have a mortgage and until recently I worked.
I am now SAHM as I inheritted some money - this has put me over the threshold for benefits but I still get child benefit, carers allowance, child tax credit and about £30 a week CSA - I haven't yet gone into my savings though I am close to that point after 4 months... My reckoning is about £100-200 a month shortfall - if I qualified for council tax benefit or housing benefit then I reckon I would easy be able to live & still run a car...
Yes my son lives in hand-me-downs but he had an ipad recently through saving and selling old toys on ebay. I sell everything once out of use. I shop around for deals on utilitys, use TopCashBack and save like mad for stuff. We dont have many holidays and I get them as cheap as possible. My biggest out-lay are my son's activities but I pay for those out of his DLA and are crucial to our sanity.
Oh and I have NO credit... nothing - not even a store card.
It is do-able - www.turn2us.org.uk is the best benefit checker online but I think other posters are right - you need to see the CAB or welfare rights just for that face2face reassurance.
As for the dog - sounds like you over-compensated as much as you could... I walk my dog on the school run - take her in the car and then take her a son for a run round the field
- everyone happy!
Good luck x