Pets at Home is recalling four lines of its AVA dry cat food products after three cats became "seriously unwell".

The food products were found to have lower levels of thiamine (Vitamin B1) present than specified in the recipe.

The cats showed symptoms ranging from sudden collapse, fitting, widespread twitching and general unsteadiness which are not the classic symptoms of thiamine deficiency.

The Food Standards Agency issued a product recall of the following items:

Product: AVA Veterinary Approved Grain Free Mature 7+ Cat Food Optimum Health

Pack size: 2kg

Product code (under the barcode): 7120400

Batch codes:

6165 – best before 14 June 2017

6181 – best before 30 June 2017

6295 – best before 22 October 2017

6363 – best before 29 December 2017

Product: AVA Veterinary Approved Grain Free Mature 7+ Cat Food Optimum Health

Pack size: 4kg

Product code (under the barcode): 712401

Batch codes:

6165 – best before 14 June 2017

6169 – best before 18 June 2017

6210 – best before 29 July 2017

6252 – best before 09 September 2017

6325 – best before 21 November 2017

7016 – best before 16 January 2018

Product: AVA Veterinary Approved Grain Free Senior 12+ Cat Food Optimum Health

Pack size: 2kg

Product code (under the barcode): 712402

Batch codes:

6161 – best before 10 June 2017

6166 – best before 15 June 2017

6229 – best before 17 August 2017

Product: AVA Veterinary Approved Grain Free Adult Cat Food Indoor/Neutured

Pack size: 1.5kg

Product code (under the barcode): 712407

Batch codes:

6165 – best before 14 June 2017

6166 – best before 15 June 2017

6188 – best before 07 July 2017 

7006 – best before 6 January 2018

No other AVA or Pets At Home products are known to be affected.

A FSA spokesperson said: "If you have bought any of the listed products with the specified product codes, please return it to where you bought it for a full refund or call 0800 328 4204.

"If you have concerns that your cat may be showing any of these symptoms after switching to one of the four affected products then you should stop feeding and seek immediate veterinary advice.

"You can also contact one of Pets At Home customer advisers on 0800 328 4204 for general advice."