Block – Bioactive Bites

Block is a specialist allergy and skin support supplement designed for dogs experiencing allergic reactions, including seasonal sensitivities, environmental triggers, food intolerances and atopic dermatitis. Its multi-pathway formulation combines natural antihistamines from three botanical sources, essential fatty acids for skin barrier repair, immune-modulating compounds and gut-skin axis support to address both the immediate itch and the underlying immune dysregulation driving chronic allergic conditions.

Block’s three botanical quercetin sources, Sophora japonica, Stinging Nettle and Cranberry, form a multi-source quercetin network that stabilises mast cell membranes and inhibits histamine release before it triggers allergic symptoms. Unlike pharmaceutical antihistamines that block histamine receptors after release, quercetin works upstream to prevent degranulation, providing more comprehensive relief without the drowsiness or tolerance development common with conventional antihistamines.

The gut-skin axis describes the bidirectional communication between the gut microbiome and the skin. An imbalanced gut microbiome increases systemic inflammation and intestinal permeability, allowing allergens to enter the bloodstream more easily and amplifying immune reactions that manifest in the skin. A well-nourished gut microbiome with healthy barrier function helps regulate immune responses and reduces the allergen burden reaching systemic circulation. Block supports the gut-skin axis through its prebiotic, postbiotic and clinoptilolite components, addressing allergy from the inside out.

Block is formulated to support skin comfort, barrier function and healthy immune regulation in dogs with atopic dermatitis and related allergic conditions. Its multi-pathway approach targets both symptomatic relief and the underlying immunological and barrier dysfunction that drive chronic atopic disease. Block is not a veterinary medicine and does not replace prescription treatment for moderate to severe atopic dermatitis. We always recommend discussing supplementation with your vet, particularly if your dog is already on Apoquel, Cytopoint or immunosuppressants.

For seasonal allergies, starting Block two to four weeks before the anticipated trigger season allows time for the immune-regulatory and microbiome-modulating compounds to establish before allergen exposure peaks. For year-round environmental or food sensitivities, Block is designed for daily ongoing use. The quercetin and anti-inflammatory compounds provide more effective support when taken consistently rather than reactively.

Block is the allergy and skin health supplement, targeting the internal immune and inflammatory pathways that drive allergic reactions, itching and atopic skin conditions. Banish is the pest and parasite repellent supplement, creating an internal and external environment that deters fleas, ticks and worms. For dogs with flea allergy dermatitis, combining Banish for flea prevention alongside Block to manage the allergic skin response is the most comprehensive approach.

The recommended dose is 1 chew per 10kg of body weight per day. A 10kg dog gets 1 chew daily, a 20kg dog gets 2 chews, and dogs over 30kg get 4 chews daily. Each chew can be given as a treat, broken into pieces over food, or fed alongside a meal.

Some improvement in acute itching may be noticeable within two to three weeks as the mast cell-stabilising quercetin compounds establish. Skin barrier repair and immune regulation build cumulatively over six to twelve weeks of consistent daily use. Dogs with long-standing chronic allergic conditions may take longer to respond than those with milder or more recent sensitivities.

Block chews are formulated to be palatable and are accepted by the vast majority of dogs. For fussy eaters, try breaking the chew into smaller pieces and mixing with food, or offering as a reward during training. If your dog does not take to them, our Happiness Guarantee means you can return your first order for a full refund: no questions asked.

Yes. Block is designed for ongoing daily use as the foundation of an allergy management plan. All ingredients are at safe, researched levels developed by a qualified canine nutritionist. Unlike long-term steroid or immunosuppressant use, Block’s natural compounds support healthy immune function rather than suppressing it, making it suitable for sustained daily use without the organ-stress concerns of pharmaceutical interventions.

Block is very well-tolerated by the vast majority of dogs. A small number may experience minor digestive adjustment in the first few days as the gut microbiome adapts to the prebiotic and postbiotic compounds. This typically resolves within a week. If your dog is on pharmaceutical immunosuppressants or antihistamines, consult your vet before adding Block.

Yes. Block is 100% plant-based with no animal-derived ingredients, no soy, no wheat, no corn and no artificial colours, flavours or preservatives. This is particularly important for dogs with food sensitivities and intolerances, where even small amounts of common allergens in a supplement could compound rather than alleviate their symptoms.

Block was formulated by Glendon Lloyd, Bonza’s Founder, who holds Diplomas in Canine Nutrition and Canine Nutrigenomics, both with Distinction, in collaboration with Bonza’s senior canine nutritionists. Every ingredient is selected based on peer-reviewed research and formulated to work synergistically through the gut-skin axis framework that underpins Bonza’s allergy approach.

When you subscribe, your renewal period calculates automatically based on your dog’s weight and daily dose. You save 10% on every delivery, get free UK and Germany shipping on orders over £39/€39, and receive a complimentary VidiVet online vet consultation subscription (UK only). It’s a rolling plan with no contract: cancel, pause or change deliveries at any time.

A daily dose of Block combines quercetin from three botanical sources, dual essential fatty acids, immune-modulating postbiotics and gut-skin axis support that would otherwise require multiple separate products. Regular vet visits, prescription antihistamines and immunosuppressants for chronic allergies typically cost hundreds of pounds per year, with significant side-effect profiles for long-term use. Block offers a natural daily foundation for allergy management at a fraction of that cost.

If for any reason your dog does not find their first delivery of Bonza Bioactive Bites delicious, your money back: no questions asked. Your dog’s health and their enjoyment of our products is our number one priority.