Can I claim my husbands service dog as a deduction for 2023 even though my husband died 2/9/2023?

[roomier]

I still have the service dog.  He was a working dog yet when my husband died.

[DoninGA]

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.

But only the costs incurred up to the date of your spouse's passing.  After that date the dog was no longer a service animal so any expenses incurred after that date are not an eligible medical expense.

[Bsch4477]

You can deduct as a medical expense the costs until the service was no longer provided.