RCMP say the 10-year-old girl was killed by two dogs in Lac Brochet, a fly-in community nearly 900 kilometres north of Winnipeg.
Police says the dogs were roaming free and have since been destroyed.
Debra Vandekerkhove of Norway House Animal Rescue says some people in northern communities own domesticated strays.
She said there are also situations where dogs are not owned by anyone, which means they are not neutered or spayed, leading to too many dogs.
"One of the things that we determined is that for every house, there are two dogs," Vandekerkhove said.
So for example, she said Norway House Cree Nation and Norway House have about 1,900 houses, so that works out to about 4,000 dogs.
"It is getting to the point with a lot of the northern reserves that we really need the province to step up and help put together more spay-neuter programs that can go up and do remote clinics for some of these remote areas.
"There are a lot of people who are very concerned for their own pets as well as the dogs they see roaming but they don't have access to any veterinarian care because they are so far away."
People in Lac Brochet have identified the dead girl as Racquelle Tssessaze (seh-sah-zay) and say she was walking home from school when she was attacked.
This is the second death of a child by a dog mauling in Manitoba this year.
Seven-year-old Gracie Herntier Clark was killed by a pair of dogs in the Rural Municipality of Springfield in March.