What should I do? I ended up ruining my shoes completely on the hike
Why did you ruin your shoes?
My friend's dog ran off andI had to chase it
It's okay if you ruined them to help out your friend. At least the dog is okay and you can get a new pair.
I don't want a new pair. I'm going to wear my shoes in the rain.
I  can understand being attached to your shoes but wearing shoes that have been damaged may cause you issues, especially when walking on wet surfaces. You might want to get them replaced. Who knows you could get the same kind of shoes as your old ones.