Alright, playing tennis balls is out because they drop down into the snow and it's Spring before we see them again
I was using a Jolly Ball with the rope running through it as my female loves it, however twice recently she has gotten a tooth jammed in and couldn't get the ball out of her mouth
So those will be hitting the garbage bin this week.
I'm out of ideas on toys that are large enough to see/find in the snow, but nothing that she's going to hook a tooth into