Bassador thats a new one . Obedience is essential for any dog so that would be a start. But then having a scent hound x retriever instinct to hunt and explore could be too much for an offlead area, then again the dog could be fine... being a mutt you dont know what you are getting .

Also if the pup is coming from a rescue the foster carers/ shelter staff should be able to help you with any Qs you have.