No. The ADA does not require service animals to wear a vest, ID tag, or specific harness. Does the service animal have to wear a vest or identifying harness?No. Under the ADA service animals are not required to wear a vest, ID tag or harness. Arizona and federal law allow you to bring service dogs, but not emotional support animals, to all public places. Do service animals have to wear a vest or patch or special harness identifying them as service animals? The only dogs allowed under the Rehab Act are dogs that mitigate their handlers' disability and perform tasks for those disabilities. This Agreement contains the complete terms and conditions that apply to your participation in our site. Because service animals are not required to wear vests, a dog that is wearing a vest is not necessarily a service animal. This contract was developed specifically for dog walkers and includes the vital information you'll need to record for your dog-walking assignments.