Hi André. Here in Italy, especially in the Southern part, there are some CzW with Leishmaniasis. Anyway if you live in a zone where the disease is present, it's better for you to prevent it. There are products that avoid the little mosquitos to bite the dog and transmit the disease. I use them too 'cause there is a little risk in my zone too and I want my Spettro to be safe
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I don't know in Portugal what can be on sale, go and ask to your veterinary