I was told yesterday by a friend who has been riding my horse for me that she (my horse) has rectal cancer. She checked under her tail and sort of went "oh no". I will get her to a vet but has anyone else had this happen and what were the results??

I'm not happy with it as I've only had her for 12 months (saved her from the doggers) and haven't been able to ride her yet as she had severe seedy toe in all hooves. We have just gotten her right with that and then this happens. By the way she is a few spot appaloosa but mainly white/grey. Thanks for any responses.