If you decide to remove them from your pine trees first spray the cotton like mass with hair spray this will keep it all together and stop the blighter's falling out and their hairs becoming airborne Then you must burn the offending branch with said bud intact. These are very dangerous to your dogs and indeed yourself if you inhale the hairs from them.DO NOT TREAT LIGHTLY THESE ARE DANGEROUS.

http://www.mythankyoupage.com/pets-and-animals/dogs-and-killer-processionary-caterpillars-in-portugal/



https://en.wikipedia.org/wiki/Pine_processionary

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