Both my dogs stay on heartworm medication year-round .
When we got Maddie, she was getting her dose mid-month. Jack gets his at the beginning of the month, and they both get their flea/tick preventative at that time too.
I want to change Maddie's Interceptor dose to match Jack's, so it will be easier to keep track of (and I'll be less likely to miss a dose). I think shifting the schedule in winter, after we've had a prolonged hard freeze (and therefore no risk of mosquitoes) would likely be best.
Does anyone know the best spacing to change the date? Can I safely shift by a full week each month over a two or three month period? Or should I shift in 3-day increments, which would take about 5 months to complete?