Smarter Pet Care.
HSA/FSA Eligible.

An HSA (Health Savings Account) and an FSA (Flexible Spending Account) are tax-advantaged accounts that let you set aside pre-tax money for qualified medical expenses—like your Litter-Robot® automatic litter box and select accessories.

Yes! Select Whisker products are HSA/FSA eligible with a valid Letter of Medical Necessity (LMN). We’ve partnered with Flex to make this process seamless.

An LMN is a letter from a licensed healthcare provider that states a product is medically necessary to treat or alleviate a specific health condition. It’s what makes “dual-use” products like Litter-Robot and Feeder-Robot eligible for HSA/FSA funds.

You may qualify if you experience:

• Moderate persistent asthma
• Mild intermittent asthma
• Allergies
• Odor sensitivity syndrome
• Immunodeficiency
• Toxoplasmosis
• Allergic Dermatitis
• Irritant Contact Dermatitis
• Dermaphytosis
• Pregnancy
• Generalized Anxiety Disorder (GAD)
• Attention Deficit Hyperactivity Disorder (ADHD)
• Depression
• Social Anxiety Disorder
• Cerebral Palsy
• Vision Loss
• Arthritis
• Chronic Back Pain
• Back injury or condition (e.g., scoliosis, herniated disc)

Eligible products include:

• Litter-Robot 4, 5, EVO, and 5 Pro
• Feeder-Robot
• HSA/FSA Litter-Robot 4, 5, or EVO Bundle

*Look for the HSA/FSA badge on product pages.

Choose Flex at checkout. You’ll complete a brief telehealth consultation, sharing your symptoms. A licensed provider will review your case and issue an LMN if eligible — usually within 24 hours.

We’ll cover the $10 LMN fee, so you pay nothing to get started.

Yes. When checking out, select HSA/FSA payment and continue with Flex. You’ll be prompted to enter both your HSA/FSA card and another card for any ineligible items in your cart.

If your provider supports partial authorization, Flex will apply the remaining balance on your HSA/FSA card and allow you to complete the transaction with a second card. If not, you’ll need to pay with a standard card and submit your receipt and LMN for reimbursement.

Yes. After you receive your LMN and receipt from Flex, you can file a claim with your HSA/FSA provider by uploading both documents through their portal.

HSA/FSA funds can only be used for yourself and your eligible dependents under IRS rules. Be sure to confirm the recipient qualifies.

Yes. We recommend uploading your supporting documentation to your HSA/FSA provider. Here’s how:

• Download the attached receipt and Letter of Medical Necessity (LMN).
• Log in to your HSA/FSA provider’s website.
• Navigate to the Claims or Reimbursement section.
• Upload both the receipt and LMN.

If your symptoms don’t meet the requirements, the provider may deny your LMN. In that case, you won’t be able to use HSA/FSA funds, but you can still purchase the product using a different payment method.

Approved LMNs are valid for 12 months from the date of issue and cannot be used retroactively for purchases made before approval.

Yes, as long as your return is approved under Whisker’s policy. Refunds must go back to the original HSA/FSA card used for the purchase. If your account is closed, we may not be able to process the return.

For help with your Letter of Medical Necessity, receipts, or Flex payment process, contact: support@flex.com

HSA funds never expire, so refunds always process normally. The refunded amount is returned to the customer’s HSA balance and can be reused at any time.

FSA funds are tied to a specific plan year and may expire if unused. If a refund is requested before the funds expire, it can typically be returned to the original FSA card without issue. If the refund is returned after the funds have expired, the refund is returned to the FSA administrator.

Refunds are always routed back to the original FSA wallet. If the funds have expired, the refund goes to the FSA administrator. The customer would need to work with their employer or benefits administrator to recover those funds.