If after tick removal its head or mouthparts are left behind, don’t panic. You’ve killed the tick and removed its body, preventing any serious risk of disease transmission. But any residual parts can still lead to infection at the site of attachment. If your cat or dog is running around with part of a tick inside them, they may not even realise it, but it is always advisable to speak to your vet; in some cases, you may need to take action to prevent infection. Disinfect the area - In situations when part of the tick is stuck in your pet, it's important to clean the area by wiping with salt water and monitoring your pet so you can take action when necessary. Your vet will be able to advise you on the best course of action, depending on whether the remnants of the tick are causing harm to your pet. If the affected area has already become infected, your vet may prescribe a topical antibiotic or a course of oral antibiotics to help treat it. Signs a tick has infected your pet In some cases, the stuck part of the tick may be so small you don’t even realise there’s a problem until your dog or cat’s skin starts to react.