I don't believe I've ever seen snow agility before.
I'm assuming Eddie uses the reguar size equipment since you mentioned a big dog.
I switched Prince to teacup agility because he can't concentrate around big dogs - he spends too much time trying to hide from them. He will not go up the teacup A frame. He acts like he is scared to death of it. The regular size A frame was standing along the wall and he ran up and down it without a problem. He even sneaks over to play on it. Talk about a brat!