When dealing with gnats in an environment where rabbits are present, it's important to prioritize their safety. You'll want to use a gnat spray that is safe for rabbits and doesn't pose any harm to them. Instead of using chemical sprays, it's advisable to opt for natural remedies that can effectively repel gnats. Here are a few options:

1. Vinegar Spray: Mix equal parts of water and white vinegar in a spray bottle. Gnats are repelled by the smell of vinegar, so spraying this solution in gnat-infested areas can deter them. However, be sure not to spray it directly on your rabbit.

2. Essential Oil Spray: Create a mixture of water and a few drops of essential oils known for their gnat-repelling properties. Some suitable options include citronella, eucalyptus, lemongrass, or lavender oil. Shake the mixture well and spray it around the affected areas, making sure your rabbit is in a different location to avoid direct contact.

3. Apple Cider Vinegar Trap: Instead of spraying, you can set up a trap using apple cider vinegar. Fill a shallow dish with apple cider vinegar and add a few drops of dish soap to break the surface tension. The gnats will be attracted to the vinegar, but the soap will cause them to sink and drown. Place the trap away from your rabbits.

Remember, prevention is key when it comes to dealing with gnats. Keep your rabbit's living environment clean, remove any potential breeding grounds for gnats, and ensure proper waste disposal. Additionally, consider using fans to create airflow, as gnats are less likely to be present in areas with a strong breeze.

If you're uncertain about using any product or method around your rabbits, it's always best to consult with a veterinarian who can provide specific advice based on your rabbit's individual needs.