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When a rescued Greyhound is adopted, it is important to set boundaries right from the onset. Although these rescue dogs might have unique past experiences, turning them into well-behaved pets is entirely possible with the right approach.

Many greyhounds might not have experienced life outside the racing track; they might be oblivious to what a home setting involves. This is why setting boundaries is pivotal.

1. Start Training Immediately:
   Begin training as soon as the Greyhound arrives at your home. Dogs learn best from consistency – establishing rules immediately helps them to understand their new home environment.

2. Use Positive Enforcement:
   Greyhounds respond extremely well to positive reinforcement. This involves rewarding wanted behaviors and gently discouraging unwanted ones. Rewards can be actions such as verbal praises, gentle petting, treats, or a fun game.

3. Establish Territory:
   Establish territory for your Greyhound from the onset. They should know where they can relax and sleep, and limit their access to certain areas. This helps them to understand where it’s acceptable for them to be.

4. Crate Training:
   Training your dog to be comfortable in a crate can give them a sense of security and helps prevent destructive behavior when you’re not at home. Start with short periods where you monitor them, then gradually increase the length as they become more comfortable.

5. Limit Playtime Indoors:
   Greyhounds are sprinters by nature, and while they require regular exercise, they should understand that indoor spaces are for calm activities. Encourage them to play outdoors in a yard or during walks.

6. Train Basic Commands:
   Train your dog on basic commands like ‘sit’, ‘stay’, ‘lie down’, and ‘come’. These commands are foundations for setting boundaries. Dogs that learn these commands tend to be easier to handle.

7. Leash Training:
   Greyhounds are used to being led around tracks and are generally good on the leash. Nonetheless, leash training is crucial. It’s critical to ensure that they don’t pull on the leash and understand that you are in control during walks.

8. Teach Them to Respect Personal Space:
   Teach your dog not to jump on people or furniture. Greyhounds come with a racing or coursing instinct, so they might want to jump or climb on furniture. Deter such behavior right from the start.

9. Establish a Routine:
   Set a routine for feeding, sleeping, and outdoor activities. This routine can help your dog understand what’s expected from them at different times of the day.

10. Involve Everyone in The Training:
    Ensure that all family members understand and follow the same rules and boundaries. Consistency is key to ensure there’s no confusion for your Greyhound.

Each Greyhound comes from a different past and will require unique approaches when setting boundaries. Patience, consistency, and perseverance are important when training your rescue greyhound.