was out the other night with my dog hes a bull greyhound weaten greyhound cross everything went as normal when we go back i put him in his pen and went to bed the next day he would not eat then when he did eat he through it up again then he started turning yellow (eyes,inner ears,tounge)so i took him to the vet he lasted two days and then past away they said that his kidneys failed they asked me if he had been in a river when i said yes they said it was something to do with rats pee this is new to me was woundering has anyone else had this happen to them