Worming and Heartworm Prevention


Heartworm is transmitted by mosquitoes, so your puppy does not need to be in contact with other dogs to become infected. The worms live inside the heart and can grow to 30cm in length, interfering with circulation and eventually causing heart failure and death. Generally, there are no outward signs of the disease until it is quite advanced and although there are treatments available the disease is usually still fatal as the damage to the heart is permanent.

Puppies should start heartworm prevention at 12 weeks of age.

There are several different over the counter products available to assist preventing heartworm such as Milpro, Milbemax and Nexgard Spectra. These MUST be given on the same date every month for them to be effective. Missed doses does put your pet at risk. If a dose is missed, we recommend a heartworm test before resuming dosing.

Alternatively, Heartworm Injection (Proheart SR12)

This injection is given once a year in adults dogs, but has to be given a little more frequently in pups:

  • 1st dose – 12 weeks (when due for 2nd puppy vaccination)
  • 2nd dose – 6 months (when de-sexing is recommended)
  • 3rd dose – 15 months (when 1st annual vaccination is due)

Then every 12 months.


Intestinal worms can be transmitted from dogs to humans, especially children and can cause serious health problems. Puppies can be born with intestinal worms or pick them up from their mother soon after birth and if left untreated, can be fatal.

Please note that not all worm preparations are effective against all types of worms.

Worm puppies:

  • Every 2 weeks until 12 weeks of age, then,
  • Every month until 6 months of age, then,
  • Every 3 months

The team at Jacobs Well Veterinary Surgery offer you and your best friend a team of specialised professionals to ensure the best care each time you visit us.

Jacobs Well Veterinary Surgery

At Jacobs Well Veterinary Surgery, your pet will receive the best possible treatment and care. 
"Where they are treated like the people they are!"