hi, we have a few dexters and there brilliant, not to mention very, very tasty!
I would be looking to buy a cow that's in calf with one at foot, this way it always ha company and you don't need to worry about getting her in calf for a good while.
We have one cow who produces a calf a year which gives us a constant supply of beef. We have just sent off the two year old and she's left with last years calf and this years aswell, we'll soon put her back in calf to keep the cycle going.
Ours are the long legged ones which are a nice size for the smallholding. I think you only get a bulldog calf if you breed short to short
We have never had any calving problems at all and the calves are up on there feet in no time. They also live out all year and are very hardy. We just feed hay, barley straw or silage during the winter.