Allergy Shots for Pet Allergies: What to Expect

What Allergy Shots Are (and How They Treat Pet Allergy)

Allergy shots are a form of allergen immunotherapy. Each injection contains a measured amount of the allergens that trigger your symptoms. Over time the dose rises so your immune system learns to react less when you meet those same allergens in daily life (Mayo Clinic) (AAAAI). ACAAI calls shots (SCIT) the most commonly used and most effective form of allergy immunotherapy, and notes they treat reactions to animal dander along with pollen, mold, house dust and insect stings (ACAAI Shots).

For dog and cat allergy specifically, ACAAI says shots build tolerance by gradually injecting increasing doses of the allergen (ACAAI Pet). MedlinePlus lists animal dander among the allergens that can go into a shot series, and notes that only the allergens you test positive for are included (MedlinePlus).

Shots are different from under-the-tongue tablets (SLIT). ACAAI says the only FDA-approved SLIT tablets today are for ragweed, grass pollen and dust mite — not for dog or cat (ACAAI Shots). AAFA likewise lists FDA-approved tablets for dust mites, grass and ragweed, while noting that allergy shots can work for people with pet allergies (AAFA). For a broader overview of immunotherapy options (including SLIT), see our allergy immunotherapy guide.

Who Is a Good Candidate?

Mayo Clinic says allergy shots may be a good choice when medicines don’t control symptoms well, allergens can’t be avoided, medicines cause bothersome side effects or interact with other drugs, or you want to cut long-term medication use (Mayo Clinic). Pet allergy fits that list especially well: if you live with a dog or cat, full avoidance often isn’t realistic.

AAAAI adds that decisions weigh how long and how severe your season or year-round symptoms are, how well medicines and environmental controls are working, your desire to avoid long-term medicines, the time commitment, and cost (AAAAI). MedlinePlus says adults and children age 5 and older can receive shots, and lists animal dander among allergens for which shots are effective (MedlinePlus).

Before shots start, an allergist confirms what you’re allergic to with skin or blood testing (Mayo Clinic) (MedlinePlus). ACAAI notes a skin-prick test is the most common way to diagnose dog or cat allergy, with results usually showing in 15 to 20 minutes (ACAAI Pet). Our allergy testing guide and skin prick vs. blood test comparison explain those options. Also worth knowing: so-called hypoallergenic dog and cat breeds are not allergen-free, so breed shopping is a weak substitute for testing and treatment.

Shots aren’t for everyone. MedlinePlus says providers are less likely to recommend starting them if you have severe asthma, a heart condition, take certain medicines such as beta-blockers or ACE inhibitors, or are pregnant (though someone who already started shots before pregnancy may be able to continue) (MedlinePlus). Food allergies are not treated with allergy shots (MedlinePlus) (Mayo Clinic).

What the Schedule Looks Like

Treatment has two phases:

• Build-up. You receive shots with gradually increasing allergen doses about one to two times a week. AAAAI says this phase generally takes about four to six months with a traditional schedule; Mayo Clinic describes three to six months with shots one to three times a week (AAAAI) (Mayo Clinic). ACAAI describes weekly (sometimes more frequent) injections for about seven months before spacing out (ACAAI Shots). Exact timing varies by clinic and how you tolerate dose increases.
• Maintenance. Once the target dose is reached, shots are given less often — typically every two to four weeks for about three to five years (AAAAI) (Mayo Clinic). MedlinePlus describes maintenance about every four to six weeks over three to five years (MedlinePlus).

Some clinics offer faster build-up schedules (cluster or rush), which reach maintenance sooner but may raise the chance of a reaction; AAAAI says those options should be discussed with your allergist (AAAAI). Mayo Clinic notes that if you skip doses, you may need to drop back to lower doses for safety (Mayo Clinic).

Shots are usually given in the upper arm, in a medical office — not at home (MedlinePlus) (AAAAI). Plan on waiting about 30 minutes after each injection so staff can treat a reaction if one starts (MedlinePlus) (Mayo Clinic).

How Well Do Shots Work for Dog and Cat Allergy?

Major allergy organizations treat animal dander as a standard target for subcutaneous immunotherapy. ACAAI says shots are effective for animal dander and lists them as an effective treatment for dog and cat allergy (ACAAI Shots) (ACAAI Pet). MedlinePlus includes animal dander among allergens for which shots are effective, and notes that after several months some or all symptoms may ease, with relief that can last several years (MedlinePlus). AAFA says allergy shots can work well for people with allergies to pets, as well as pollen, dust, mold and stinging insects (AAFA).

Mayo Clinic’s general timeline (not pet-specific) is useful for expectations: symptoms usually improve during the first year, improvement is often clearest in the second year, and by the third year many people no longer have bad reactions to the allergens in their shots. After successful treatment some people stay well off shots; others need ongoing injections to keep control (Mayo Clinic). AAAAI says shots are most likely to give lasting relief if you complete at least three years, and if you haven’t improved after a year on maintenance your allergist should reassess (AAAAI).

Results vary. Dog and cat extract mixes differ, and living with the animal means ongoing exposure that pollen-allergic patients don’t face year-round in the same way. Shots can make coexisting with a pet more manageable; they don’t guarantee you’ll never react again, and they don’t make a breed “hypoallergenic.”

Risks, Side Effects and Why Shots Aren’t Enough Alone

Local redness, swelling or itching at the injection site is common (AAAAI) (Mayo Clinic). Mild nasal symptoms can occur too (MedlinePlus). Systemic reactions (hives, wheezing, throat tightness) are less common but more serious, and anaphylaxis is rare; that’s why shots are given where epinephrine and trained staff are available, with a post-shot observation period (ACAAI Shots) (Mayo Clinic) (MedlinePlus). Mayo Clinic advises avoiding vigorous exercise for at least a few hours after a shot, and telling staff if you feel unwell — especially with asthma — or had symptoms after a prior shot (Mayo Clinic).

For more on symptoms and triggers, see fur and pet allergies.

Finding an Allergist in Florida

Allergy shots should be prescribed and supervised by a clinician experienced in immunotherapy, ideally a board-certified allergist. Browse our Find an Allergist directory. In Florida, start with the Florida allergist directory, including pages for Tampa, Sarasota, Orlando and Miami. Ask about build-up vs. cluster schedules, what allergens would go in your vials, how they handle missed doses, and whether your insurance covers the extract and injection visits.

Written by: SeasonalAllergies.org Editorial Team (November 3, 2026)

This article is for general education and is not medical advice. Talk with your doctor or an allergist about your symptoms before starting, stopping or changing any treatment, including allergy shots.

Allergy Shots for Pet Allergies FAQs