hi! about the ANTI FLEA collar for dogs are advisable.. they will not make such product if it is harmful to our dogs.. it depends on the owner of the dog how they use the product. as stated on the instruction and precaution of the product it is harmful to humans when swallowed coz it cause cancer. so if you will apply the anti flea collar you should have read and understand the instruction.. about the spot on of the frontilne its can be applied 3 DAYS after bath and will last for a week so that the solution will penetrate to the epidermis of the animal and can spread. thats the time when incubated eggs of the thicks and fleas die. it is not necessary to shave the hair especially if your dogs have a beautiful hair like tzu. the anti flea collar will now be use after the you have bathe your dog and all the thicks and flea are gone.




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