Your new dog may never have lived in a house before. Everything will be new and strange. Imagine you have just landed from the moon and seen televisions, vacuum cleaners, glass doors and mirrors for the first time. Naturally it will take your dog some time to settle down.
A rescue Greyhound may never have shared food. Every bit of food they have seen has been theirs. Alternatively they may have learnt to fight for food if in a shared paddock. Some dogs can become very possessive/greedy about food. If this is not handled properly aggression over food may develop, which can have sad repercussions for both owner and dog.
Please follow these rules to help your dog learn to be around food safely:
Some greyhounds coming out of racing may display these problems. They are kept at minimum weight to race. Every piece of food in their kennel has been for them. So they have to learn that you are the person who makes decisions about what they eat and when they eat.
Most of this is common sense. Imagine how your behaviour would develop if you faced constant threat of starvation or had to compete for food. Help your rescue dog to live happily for the rest of his life by following these simple rules.