We recommend the midwest 42" crate with two doors. The doors are on the end and side so it can be positioned anyway you need. It comes with a divider so the crate will work for the life of your dog. They also make beds that fit inside and covers to make your dog feel more secure in his cave.
Flea and Tick
We use and recommend K9 Advantix II. It is a monthly topically applied flea and tick preventive. It works very well and we've never had a problem with either fleas or ticks. There are 3 sizes 11 -20 lbs, 21-55 lbs and 55+ Lbs. Each pack has multiple months. We just put the date on our phone calendar and it reminds us so we never miss it.