Dosage Guide • FL · NY · VA • Reviewed by Dr. Tiffany Delacruz, DVM
Apoquel Dosage for a 20 lb Dog
oclacitinib · Janus kinase (JAK) inhibitor · Small breed (20 lb / 9 kg)
What pet owners in Florida, New York, and Virginia need to know about Apoquel dosing for a 20 lb (Beagles-sized) dog — written by a licensed vet, no specific dose given without an exam.
The dosing principle for Apoquel
Apoquel is dosed at approximately 0.4-0.6 mg/kg twice daily for the first 14 days, then once daily for maintenance. Apoquel tablets are available in fixed strengths (3.6 mg, 5.4 mg, 16 mg) — a vet selects the closest fit for your dog's weight.
Apoquel is highly weight-dependent because it comes in discrete tablet strengths. Using a tablet sized for a heavier dog risks immune suppression and side effects; using one too small leaves the dog itchy and uncomfortable. Vets calculate the closest fit and may combine tablet strengths to dial in the right dose.
Why 20 lb matters
A 20 lb (9 kg) dog falls into the small category — typical examples include Beagles, Cavalier King Charles Spaniels, Pugs, and Boston Terriers.
Small breeds in this weight range are common pet sizes, but breed-specific predispositions (e.g., Pug airway issues, Cavalier heart disease) can affect drug choice and dosing. A breed-aware vet is especially valuable for these dogs.
What Apoquel is approved for
- Pruritus (itching) caused by allergic dermatitis
- Atopic dermatitis in dogs at least 12 months old
What to watch for in your 20 lb dog
- GI upset — vomiting, diarrhea, or decreased appetite (uncommon)
- Lethargy in the first few days
- Worsening or new skin infections (rare — Apoquel mildly suppresses immune function)
- Increased tendency to develop demodex mange in young dogs
- Any new tumors or growths — bring up at every check-in
Get a Apoquel prescription or refill in your state
RexVet is licensed in Florida, New York, and Virginia. Our veterinarians can examine your 20 lb dog by video, calculate the right Apoquel dose for their specific situation, and either fill the prescription through our in-house pharmacy or send it to a local pharmacy near you.
Florida
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New York
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Virginia
Online vet care for VA pet owners — Virginia Beach, Richmond, Norfolk, Arlington, and 20+ VA cities.
Frequently asked questions
Frequently asked questions
How much Apoquel can I give my 20 lb dog?
Apoquel is dosed at approximately 0.4-0.6 mg/kg twice daily for the first 14 days, then once daily for maintenance. Apoquel tablets are available in fixed strengths (3.6 mg, 5.4 mg, 16 mg) — a vet selects the closest fit for your dog's weight. For a 20 lb (9 kg) dog, this gives a range that a licensed vet will narrow down based on the indication, your dog's age, kidney/liver function, and any other medications. RexVet vets serve Florida, New York, and Virginia and can calculate the right dose for your specific dog in a $64.99 video visit.
Is Apoquel safe for a small dog like mine?
Apoquel (oclacitinib) is widely used in dogs in the 20 lb range, but "safe" depends on the specific dog, not just the weight. Small breeds in this weight range are common pet sizes, but breed-specific predispositions (e.g., Pug airway issues, Cavalier heart disease) can affect drug choice and dosing. A breed-aware vet is especially valuable for these dogs. A licensed vet will check your dog's history, current medications, and any underlying conditions before prescribing.
What should I watch for after giving my 20 lb dog Apoquel?
The most common things to watch for are: GI upset — vomiting, diarrhea, or decreased appetite (uncommon); Lethargy in the first few days; Worsening or new skin infections (rare — Apoquel mildly suppresses immune function). If you see anything concerning, contact a vet. For small dogs specifically: Small breeds in this weight range are common pet sizes, but breed-specific predispositions (e.g., Pug airway issues, Cavalier heart disease) can affect drug choice and dosing.
Can a RexVet online vet prescribe Apoquel for my 20 lb dog?
Yes — if your dog is in Florida, New York, or Virginia and the medical situation is appropriate. Apoquel is one of the medications RexVet's licensed veterinarians can prescribe via a $64.99 video visit. The vet will examine your dog by video, ask about history, and either prescribe Apoquel at the right dose for your dog's weight (20 lb) or recommend a different approach if needed.
Can I get a Apoquel refill in Florida, New York, or Virginia online?
Yes. RexVet is licensed in all three states and can refill Apoquel prescriptions for dogs already established on the medication. Refill visits are also $64.99. Prescriptions are filled through RexVet's in-house pharmacy (RexVetRx) or can be sent to your local pharmacy. Same-day delivery is available in most ZIP codes in FL, NY, and VA.
Apoquel dosing for other dog weights
Other medications dosed for a 20 lb dog
Sources
Last fact-checked: 2026-06-01. Reviewed by Dr. Tiffany Delacruz, DVM. RexVet (Rex Vets Inc.) is licensed in Florida, New York, and Virginia.
Get the right Apoquel dose for your 20 lb dog
Licensed RexVet veterinarians serving Florida, New York, and Virginia. $64.99 video visits, no membership required.