Dogs fighting

[Freedom]

Having them fixed greatly reduces the risk of cancer.

[Seravieve]

I would imagine they're just playing... As if they were really fighting, there'd be blood. Dachshund teeth are sharp little things.. had one bite me a few years back.

If there is no intention to breed, or other underlying health problems, there is no reason to not fix your dogs. It will prevent them from marking in the house, prevent unwanted litters, and will prevent them from getting cancer. I'd definitely recommend it.