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Logic Firm (was Diar-Stop)


  • Select Option
  • 10ml (for cats and dogs under 7kg)
  • 24ml (for dogs between 7-30kg)
  • 60ml (for dogs between 30-60kg)
Max 1 per customer
£10.61 - £14.69
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Logic Firm Paste for Cats and Dogs

Logic Firm is an intestinal protectant for dogs and cats to help manage digestive upsets by helping to improve stool consistency and reducing fluid loss.

Logic Firm Paste contains 4 key ingredients:

Montmorillonite – A natural clay which coats and protects the lining of the gut. Binds toxins and microorganisms.

Prebiotics (FOS - fructo-oligosaccharides) - Promotes the growth of beneficial bacteria in the gut. Provides an energy source for the cells of the large intestine.

Electrolytes – Help restore sodium, potassium and magnesium which are lost during digestive upsets.

Dextrose – Provides an energy source for cells of the small intestine.

Each Logic Firm Paste syringe provides a 3-day course.

10ml syringe for cats and dogs under 7kg
24ml syringe for dogs between 7kg & 30kg  
60ml syringe for dogs between 30kg & 60kg             

Logic Firm Paste should not be used for more than 3 days. If symptoms persist or your pet's condition worsen, please consult your veterinary surgeon.

Can I use it on my cats Yes, this can be used in both dogs and cats. Usually the 10ml size syringe is suggested for cats. -- Can I use on my pregnant cat We would advise you speak to your veterinary surgeon before using this on a pregnant cat

Shipping charges mainland GB zone1

Value Weight Delivery Charge
Over £49.00 Any Weight FREE
Under £49.00 No weight limit £4.50
Under £49.00 Under 250 grams £3.49

Most orders are despatched the same day and standard delivery is 3 to 5 working days from despatch. FAST Expedited options are available at extra cost - these usually arrive in 24-48hrs from dispatch but delays are possible during busy periods.

Postcodes outside of Zone 1 (including some areas within mainland UK) may incur extra carriage charges due to surcharges imposed by the couriers. These will be calculated on the website at the checkout.

NB: Orders placed with faster delivery must be placed before 13:00 to ensure same day dispatch (excluding weekends and bank holidays). Please also check on the product page that the items ordered show 'In Stock' otherwise your order will be delayed until the stock becomes available, which in most cases will only be 24hrs.

Estimated "Usually shipped in" information is shown against most products

Overseas orders

We no longer send goods outside of the UK.

Prescription Items

Prescription items will be sent on receipt of a valid signed and dated prescription.

Pick up

We offer a pickup service for orders placed over the phone.

Please ring us on 01833 641112 for more information.

Refrigerated Items

Refrigerated items will be sent by carrier or express delivery at a cost of £7.50, with coolpacks, unless you pay for a premium for a refrigerated delivery. We will contact you prior to despatch for your instructions.

We want you to be completely satisfied with any purchase. If not any item* can be returned to us within 14 days of receipt for exchange or refund Please give us a ring for a returns number on 01833 641112 or alternatively email to obtain a returns number.

*Due to legal requirements medicines may not be returned except to correct an error in despatch or in response to an "official recall". If an item is believed to be faulty it should be returned for inspection and it may be necessary to forward it to the manufacturers for testing before replacements or refunds can be authorised. This does not infringe legal rights. Please contact our customer services for a "Returns Number" which must appear on the outside of the package or it will not be accepted. We advise customers to use an insured method of shipping and to retain proof of despatch. We may refuse returns on products specially obtained or manufactured to order. Items must be returned unsoiled and unused and sent adequately packed and carriage paid.

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