In my opinion dog rounds in Black Ops 3 are extremely easy, i'm working on a map that I want to be challenging (no, not a challenge map).

Is there a way of increasing the speed, health and or how many spawn at a time?

Thanks.

 Exactly what I want to find out. If anyone knows how to do any of this please reply/let me know where I can find this out. Would be a great help 👍

Suggestion:

I know this would be extremely difficult but add more slots to the multiplayer lobbys so you can play with more than 3 other people at one time

Mine says:
"To run this application, you first must install one of the following versions of the .NET Framework:
v4.0.30319
contact your application publisher for instructions about obtaining appropriate version of the .NET Framework."
i'll try and find a .Net Framework v4.0.30319 download.