Hemangio is quite common, and for a long time it was thought to be somehow related to large breed dogs. Then it started to be seen more and more common in smaller breed dogs as well. Now there has been found a high percentage of Hemangio tumors have Bartonella bacteria (a tickborn disease) in them, even when there is no evidence of Bartonella in the dog’s blood.
The theory now is that the disease was seen more in large dogs first, because they are exposed to ticks more than small house dogs” are. Now that ticks are SO bad in many places, even little dogs are getting exposed to infected ticks, and more cases of Hemangio are showing up in smal dogs too.
An 8 year old Havanese belonging to a Veterinarian/breeder friend of mine died of Hemangiosarcoma last summer here in the Boston area. 😢
Researchers find more evidence of a possible connection between persistent bacterial infection and blood vessel cancer in dogs.
news.cvm.ncsu.edu