What are snake bite symptoms on a dog?

Snake bites tend to be very painful. There is a lot of edema in the area around the bite and the bite is not always detectable unless the hair is shaved from the area. Did you see your dog get bitten? If not, then although it is possible, there are other reasons why your dog could have a lump on her thigh. You should keep her confined and comfortable - blanket or dog bed to lay on - and limit movement. I also recommend that you not wait until tomorrow. If there is an emergency vet in your city you should bring her in tonight.