
I can only tell you what I did about 8 years ago. Unfortunately I did it through a SW vet and the charge to send them off to Langford was a bit steep. But I collected poo samples over 3 days from two Collies and had to take them all in together. I vaguely recollect that I was told all three days poos were mixed together, but my recall isn't as good as it used to be. Senility has set in I think. I can't even remember how much I paid.
I do twice a year as precaution too. Panacur is reliable. I've never had a problem using it. So I don't believe in rocking the boat. If it aint broke, don't fix it! :-)