Please help my ronnie dog.

Hi.some of you know my poor boy ronnie has had a very poorly foot.maybe an adder bite they say.and our insurance of £7000 has been spent.there now saying to its going to be another £6000 to £10,000 as they have had to take part of his leg skin away and tissue and will need a skin graft.the reason ive put £6000 is cause my car is going up for sale for £4500 to make the rest. I dont expect help but preying for a mirical.tha k you for reading.