Ooh, it has a name! Thanks Erny
I have had him for 2 weeks, stools appear normal and he is currently 10.45 kg. He is around knee height and you can feel all of his ribs and every little bump of his spine and his stomach area is concave. I would estimate that he has gained about .5 - 1kg since I got him, but it is hard to tell as he had a very severe haircut in between his first weigh in and his second weigh in as his fur was matted!
He is of unknown parentage - the shelter told me he is a shih tzu, but he doesn't look like a Shih Tzu. Bearded Collie x ?? has been suggested.
He has been wormed and has been to the vet more times than I care to think of in the last 2 weeks. He was suffering from quite a bad case of kennel cough, had an infected abcess on his leg and had a rash on his belly - all of which are now OK. He was on antibiotics for about 1 week and also had cortisone injections.
I have been feeding him the same food that my dachshund has been eating for the past 2 years and she is very healthy - some dry food in the morning and home made food in the evenings (checked by the vet, various recipes including pasta, rice, chicken, kangaroo, mince, veggies, grains etc etc). Have been feeding him more than I normally would in an attempt to fatten him up.