If that wasn’t surprising enough for you- there’s a cancer line that has been propagated between dogs for centuries: https://en.m.wikipedia.org/wiki/Canine_tran

If that wasn’t surprising enough for you- there’s a cancer line that has been propagated between dogs for centuries: https://en.m.wikipedia.org/wiki/Canine_transmissible_venereal_tumor https://en.m.wikipedia.org/wiki/Canine_transmissible_venerea...