DOG owners are being advised about a “mystery” deadly dog disease which strikes during the autumn.

Guiseley-based White Cross Vets says it is regularly inundated with enquiries from dog owners at this time of year who are worried about Seasonal Canine Illness, which is prevalent between September and November.

The first cases of SCI were reported in 2010 and symptoms can include vomiting, diarrhoea and lethargy that will appear within 72 hours of dogs walking through woodland in autumn.

White Cross Vets says the disease can be prevented with a flea and tick treatment, as well as checking dogs’ paws for harvest mites after walks.

Tom Ward, clinical director at the Guiseley surgery, said: “Although SCI is often making the headlines at this time of year, the reality is that it’s only a tiny percentage of dogs that become ill from it.

“Most medical evidence suggests that it may be caused by harvest mites that are particularly active at this time of year and latch on to a dog’s paws, legs, chest and tummy, often resembling red dust that becomes stuck in the fur.

“Whilst we always advise dog owners to be vigilant, most don’t necessarily need to change their habits in order to try to specifically avoid SCI. However, it’s useful to know that harvest mites are only active during the day, so walking dogs early in the morning or after dusk is a way of evading them. They also often lurk in long grass and vegetation, with the worst infestations happening when the dog sits still.

“It’s worth discussing with your vet whether the products you’re currently using provide appropriate protection for your pet’s needs.”

Seasonal Canine Illness is frequently described as a mystery illness which is little understood.

According to the website First Aid for Pets around 20 per cent of dogs developing the disease in 2010 died as a result. But thanks to increased awareness and prompt treatment that figure dropped to only 2 per cent in 2012.