ester
Not slacking multitasking
You're braver than me bringing that one up againI doubt very much that it is cancer, the weight loss tends to be rapid and Bailey wouldn't be looking otherwise healthy if it had been going on for months.
Have you considered a PPID test? My old horse didn't get fat last summer; I have had him for 18 years and he has turned into a lardarse every year without fail. Last year I had to give him hard feed to maintain his weight, so I had him tested and it came back positive.