Vets are backing a campaign aimed at raising awareness of tick-borne disease.
Dogs can be bitten while walking through wooded areas or parkland. Untreated it can lead to Lyme Disease - which affects both animals and humans.
The New Forest, South Downs and parts of Wiltshire and Berkshire are known to have high levels of ticks.
DEFRA have confirmed that a case of ash dieback has been found in a woodland in East Sussex.
It was discovered as part of an urgent survey to find traces of the disease in woods and forests
It means that the county becomes the eleventh in England where Chalara has been found. Others include Essex, Kent, West Sussex and Berkshire.
Chalara is likely to have been in England for at least two years but has only recently been discovered in forests and woodland as a result of the intensive survey carried out of sites across the UK where ash trees are known to be present.
Martin Ward, DEFRA Chief Plant Health Officer, said: “Although the rate at which we are discovering new areas infected with Chalara is slowing, there are still results coming through from our surveying exercise earlier this month and reports from landowners and the public.
"The better informed we are, the more effective we can be in our work to contain the spread and impact of this disease.”
The ash tree is a native British species of tree, providing around five percent of all woodland cover. Chalara is a serious disease that has affected a high proportion of ash trees in northern Europe and which was confirmed as present in nursery stock in the UK in March.
A further case of the tree disease, ash dieback, has been confirmed in woodland in East Sussex.
Following an ugent survey to find the disease in woods and forests, East Sussex is the eleventh county in England where Chalara has been discovered.
The number of sheep farmers in Sussex hit by the deadly Schmallenberg disease has more than doubled in the last three weeks. Figures from Defra show 59 farms have now reported being affected by the disease. Another 32 cases have been reported in Kent, ten in Hampshire and Essex.