The best place to check is the government website. Certainly there is a ban on meat and dairy products when returning to the UK but dogfood is allowed if it is a prescription food.It appears no one has then.
This may give you the help you need and worth a try!
Further information and copies of the other leaflets and notices mentioned are available at on GOV.UK
If you cannot find what you are looking for on the website, then you can phone the Helpline:
UK: 0300 200 3700 Outside the UK: +44 2920 501 261
Lines are open Monday to Friday, 8am to 6pm.
Text phone: 0300 200 3719
If English is not your first language and you need a translator to help with your enquiry, let one of our advisers know when you call us.
If you would like to speak to someone in Welsh, call 0300 200 3705
Lines are open Monday to Friday 8am to 6pm.