Does wormer resistance occur in dogs as well as horses?

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Resident YD expert Vicky Payne answers a readers question regarding wormer resistance in dogs and horses.

Q: Does wormer resistance occur in dogs as well as horses? The last time I asked a wormer manufacturer they said no because dog owners scoop poop more regularly and efficiently than horse owners! What’s your opinion on this?

Kelly Fawcett, Lincolnshire.

A: Vicky says:  There is less evidence of wormer resistance in dogs than there is in horses; however, hookworm (Ancylostoma caninum) has been found to be resistant to multiple drugs in the US, mainly in kennelled dogs. There have also been isolated reports of tapeworm (Dipylidium caninum) showing resistance to common wormers. The problem is small compared to the equine situation, but owners should ensure they use products as recommended and clear up faeces where possible to reduce environmental contamination.

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