Pet owners are being warned of a virus outbreak which can be deadly to dogs.
The Cibyn Veterinary Clinic in Caernarfon said there have been cases of parvovirus in the local area.
Symptoms can include vomiting, profuse diarrhoea which is sometimes bloody with a strong odour, lethargy and anorexia.
The vets' clinic urged the public to ensure their pets' vaccinations are up to date and to take care walking their dogs.
Parvovirus is passed from dog to dog through contact with their contaminated faeces, but the virus will not infect humans.
A post on Facebook by the Cibyn vets said: "There is a potential outbreak of parvovirus (a highly contagious viral illness that affects dogs) in the local area. Please ensure your dogs are up to date with their vaccinations.
"Care should be taken when exercising your dogs in public areas or mixing your dogs with unvaccinated dogs.
"This illness can affect dogs of all ages. If you are at all worried, please give us a call."
It is not the first time the virus has struck in North Wales and, in 2013, 20 dogs were killed in Connah's Quay .
At that time, fears were raised that it was spreading because some owners could not afford to get their pets vaccinated .
A parvovirus outbreak affected other parts of the UK last year including Cumbria, Lancashire, Lincolnshire, Yorkshire and Northumbria.
It was the second deadly animal disease to strike across the country in 2018, after Alabama Rot claimed the lives of a number of dogs.
Vets have said it's important that owners pick up the early signs of parvovirus and seek veterinary advice as the first 48 hours are critical.
Puppies should be vaccinated at eight weeks and then vaccinations should be updated throughout their lifetime.
To have your say on this story, use the comments section below.