Vomiting After Flea Treatment in NZ: What To Do

Why this happens
Some pets get mild tummy upset after a new flea or tick treatment. Chews can cause brief nausea in a few dogs. Spot-ons rarely cause vomiting, but cats may drool if they taste product during grooming. Mild signs often pass within a day.

Before you give a chew

• Give with or soon after a meal.

• Use the correct weight band for today’s weight.

• Keep dose time calm and low stress.

• Avoid rich treats or new foods on dose day.

If your pet vomits after a chew

• If it is a single vomit and your pet seems bright, offer small amounts of water and monitor.

• Do not give another full dose unless the label or your vet advises it.

• If vomiting repeats, if there is diarrhoea, or your pet seems unwell, call your vet.

• Next time, give the chew with a proper meal. You can also ask about switching to a spot-on.

If you use a spot-on and your cat drools

• Brief drooling can happen if a cat grooms the area.

• Apply at the back of the head where they cannot reach and separate pets until dry.

• Offer water and monitor. If signs persist, call your vet.

When to see a vet now

• Repeated vomiting or vomiting with diarrhoea.

• Blood in vomit, weakness, wobbliness or fast breathing.

• A puppy or kitten, seniors, pregnant pets, or pets with other illnesses.

Choosing the right application
If tummy upset is a pattern with chews, a spot-on may suit better. If your pet dislikes skin products, a chew can be easier. The best choice is the one you can give on time, every time.

Trusted options in our NZ range

• Dogs, monthly chew for fleas and ticks: Nexgard chewables for dogs

• Dogs, long-acting spot-on alternative: Bravecto topical solution for dogs

• Cats, broad monthly spot-on with tick cover: Revolution Plus spot-on for cats

• Cats, long-acting flea and tick spot-on: Bravecto spot-on for cats

Safe use checklist

• Weigh your pet and choose the correct pack each time.

• Use dog products on dogs only. Never use dog products on cats.

• Do not combine treatments unless your vet advises it.

• Apply spot-ons to clean, dry skin and keep the site away from children and other pets until dry.

• Read the label before every dose and set phone reminders so you do not miss dates.

FAQ

My dog vomited soon after a chew. Should I redose
Do not redose without advice. Timing rules vary by product. Ask your vet for next steps.

Can I switch from a chew to a spot-on
Yes. Start the new product when the previous one would have been due. Avoid overlap unless your vet says it is safe.

What if my cat licked the spot-on area
Wipe any residue you can reach, offer water and monitor. Next time, apply at the back of the head and separate pets until dry.

Will food help prevent nausea with chews
Often yes. Give with or right after a meal and keep dose day low key.

Need help choosing
Tell us your pet’s age, weight and routine and we will suggest a simple plan. Contact us.