For both Dogs and Cats:

• Vaccinations records from your Veterinarian (Rabies, Parvovirus, Distemper, Parainfluenza, etc)
  
• A variety of small bite treats and a treat pouch or something to carry the treats. 

Only for Dogs:

• 4' to 6' leather or nylon leash (NO flexi, retractable or chain leashes)
  
• Buckle collar, Martingale collar, head halter or easy-walk harness (NO choke, prong collars or harnesses the hook on back)
  
• Water bowl or container.