You can claim your dog only if he is a service dog - it would be deductible as medical expense.
You can include
in medical expenses the costs of buying, training, and maintaining a guide dog
or other service animal to assist a visually impaired or hearing disabled
person, or a person with other physical disabilities. In general, this includes
any costs, such as food, grooming, and veterinary care, incurred in maintaining
the health and vitality of the service animal so that it may perform its
duties.