goose help

[rawrmonsterbg]

This is my first time raising waterfowl. I adopted an orphaned Canada goose a few weeks ago. He's about 4 weeks old and his feathers are starting to come in. He's on Purina non medicated start and grow and gets some fresh spinach and lettuce everyday. But his beak and legs are a bit pale. And he has been drooling quite a bit tonight. He seems otherwise ok. He wanders around and is eating and drinking plenty. But I'm still a bit worried. Any advice would be greatly appreciated!