Dalsland is a very safe region in general. The obvious risks that have to be considered when paddling are hypothermia in case of capsizing and injuries where you won't have immediate access to a hospital.
Please see also: Where can I get help in case of an accident
There are no for humans dangerous animals in the wilderness. There are some rather small wolf packs in the region. But there are no accidents that have been reported in modern times. If you should get close to moose in nature, we recommend not to approach them, especially if they are with offspring.