Hi Katy,
So Sorry what has happened,
what did your dogs eat? were they eating a dry kibble, did you rotate your dry kibbles or just feed the same brand 24/7.. Did your dogs have human foods & less kibble?
If you’re are on Face Book follow “Rodney Habib” he’s been traveling the world speaking with scientists etc & trying to work out why some dogs like Maggie from Australia lived till she was 30yrs old?? google “Maggie The Oldest dog in the world” then there’s other dogs like your poor dogs that get cancer, some dogs are as young a 3- 4yrs old…
google “Ketopet Diet” & follow Ketopet on f/Rodney has a really good video about a dog name Carli she survived the cancer your dog has..look in his video’s
