Should I buy my dog a muzzle when taking her to the dog beach?

you should walk your dog with your neighbours dog as they seem to get along ... you do not bring an aggressive dog to a dog park/beach with a muzzle, you would just cause a huge dog fight ... it is your dogs energy that would set off the fight and the muzzle would make no difference ... your dog does not need doggie friends ... it does need to not attack other dogs ... and that can be accomplished by you ignoring other dogs on walks and ignoring your dogs behavior and just keep walking ... but do not bring your dog to a dog park/beach, that is for socialized dogs and it is not where you take a dog to socialize it ... you could do training classes with your dog, that helps to socialize them to other dogs in a safe environment ...