Ehrlichia canis – Client Information 

 
 
The red area indicates a higher likelihood of exposure to brown dog ticks.
However, E.canis—infected ticks are currently limited to northern WA and SA, all of NT and northwestern Queensland.
 

Ehrlichia canis is a tick-borne bacterial infection that affects dogs. It is spread primarily by the brown dog tick, which is common in North Queensland. This disease can range from mild to life-threatening, especially if not treated early. 

At Bohle Vet Surgery in Townsville, we are seeing increasing awareness of this condition, and early detection is critical for the best outcome. 

How do dogs get Ehrlichia?

Dogs become infected when bitten by an infected tick. Important facts: 

  • The tick must attach and feed to transmit the bacteria 
  • Infection can occur anywhere ticks are present 
  • Dogs that spend time outdoors are at higher risk 
  • Even indoor dogs can be exposed if ticks are brought inside 

Signs to watch for

Symptoms can vary and may appear weeks to months after infection. Common signs include: 

  • Fever 
  • Lethargy or weakness 
  • Loss of appetite 
  • Weight loss 
  • Swollen lymph nodes 
  • Nosebleeds or unusual bleeding 
  • Bruising on the skin 
  • Eye inflammation 

 Some dogs show very mild signs at first, so routine testing in tick-risk areas is important. 

Why early diagnosis matters 

Ehrlichia infection progresses through stages: 

  1. Acute stage – often responds well to treatment 
  2. Subclinical stage – dog appears normal but infection persists 
  3. Chronic stage – can cause serious, sometimes irreversible illness 

Early treatment greatly improves recovery and reduces complications. 

How is it diagnosed? 

Your veterinarian may recommend: 

  • Blood tests 
  • Tick history review 
  • Clinical examination 

In North Queensland, testing may be recommended even for dogs with vague symptoms. 

Treatment 

Most dogs respond well when treated early. 

Typical treatment involves: 

  • A course of specific antibiotics 
  • Supportive care if needed 
  • Follow-up blood tests 

Some chronic cases may require longer management. 

Prevention is essential 

Because ticks are the main source of infection, year-round tick prevention is the best protection. 

We recommend: 

  • Consistent use of vet-approved tick preventatives. 
  • Consistent use of vet-approved tick repellent collar (Seresto Collar).
  • Daily tick checks, especially in tick season 
  • Keeping yards tidy and reducing tick habitat 
  • Prompt removal of any ticks found 

Our team can help you choose the most effective prevention for your dog’s lifestyle. 

When to contact us 

Please book an appointment if your dog: 

  • Has had tick exposure 
  • Shows any of the symptoms listed 
  • Has missed tick prevention 
  • Needs routine screening in high-risk areas 

Early assessment can make a significant difference.