It amazes me what people are willing to put up with in regards to animals - maybe you need to watch "dog whisperer"...
I see 4 triangles that can be taken out and replaced, and a patched batting - there's no way you can get around a patched backing but the top can be fixed more or less 'like new'... just get out the seam ripper and work carefully - it will all have to be done by hand tho..