Hello, I'm Dr. Deb. I'll do my best to help you today.
I'm sorry that Kylie is having looser stools issues.
Loperamine or Imodium can be given to dogs but I tend to avoid it's use for a number of reasons.
I've seen a number of dogs develop side effects such as constipation, bloat, and sedation with other, potentially, more serious adverse effects also possible: paralytic ileus, toxic megacolon, pancreatitis, and central nervous system signs.
In addition, collies, shepherds, related breeds, or other dogs who have a defective MDR-1 gene mutation may be overly sensitive to loperamide and it's use should be avoided.
But, the dose for a 64 lb dog would be 1 mg 2 times daily but I only use it for 1-2 days.
Another option would be over the counter Pepto Bismol as long as Kylie isn't vomiting and isn't taking any non-steroidal anti-inflammatory medication.
The dose would be 1 teaspoon/ 5-10 lbs of body weight 2-3 times a day which means the dose for a 64 lb dog would be about 2-4 tablespoons.
This drug can discolor the feces to a gray-black or greenish color though so this shouldn't concern you if it happens.
Pepto bismol should not be given to vomiting dogs since it contains salicylates (the active ingredient in Aspirin) which can irritate the stomach.
I'd also suggest a bland diet of boiled chicken and rice and possibly a good probiotic such as Forti Flora (which may be available at local pet or grain stores).
Most dogs will respond to symptomatic treatment as outlined above but if the diarrhea doesn't improve after a few days, then a vet visit may be prudent.
I hope this helps. Deb