It appears our Yellow Labrador Niblet has contract this bloody terrible illness

Last week he was off his food not touching his Kibble and only a little chicken, being old 10.5 years we thought he was just getting fussy. He was starting vomiting his po was little and runny and he was really lethargic some of which we put down to this hot weather as he was drinking a lot. On Wednesday he was laying on his back legs akimbo and I noticed his tummy was yellow, further inspection showed his eyes and gums were bright yellow, his pee was like lucozade.
Went to the vet thinking the worst with his liver and after blood tests and a scan he had intravenous antibiotics followed by two types of oral antibiotics one the size of a old shilling and 1+ 1/2 of the other the size of a tanner twice a day. He is still very lethargic and won't eat so I can't put the pills in a treat he also has to have a powder liver supplement daily and keeps trying to be sick. He has got wise to me pushing then down his throat and puts up a hell of a struggle so does anyone have any ideas of how to get them into him

In a way I was relieved that it wasn't C but he is still not at all well and cost me £400 so far but hopefully he will recover, he was a rescue dog and we couldn't transfer the pet insurance over. We are going to the vet today with Bonzo the Chocolate lab to be inoculated, to protect him and we are keeping to a rigid sterile clean routine because it can transfer to humans. I also water areas where he pees with Jayes fluid
So please be very careful when walking dogs in areas where there are foxes or rats, don't let them drink stagnant water, water from puddles or lick grass.