Mine is 8 mos and 2 lbs 5 oz, and I have given her senitinel twice. The first time, she acted strange, the 2nd time right after I gave it she threw up, so, I haven't given her anything else. I hate it, as I don't want her getting fleas, and all the other dogs are on stuff for fleas and ticks. I just bough a lot of k9 advantix as the vet was having a sale on hers, but, am scared to death to put it on my little one |