I am SO sorry to hear of your hardships with your animals...
and, please don't take what I'm about to say as being harsh.
One MUST check out the Breeder thoroughly !
Ask for references who you CAN contact, to establish a healthy
BloodLine for that Breeder. NOT buying an animal from a Breeder
who won't furnish that information, will force him by excluding from
sales, to reduce the quantity of unhealthy animals out there.
I just don't use a volume Breeder for just such as you have experienced.
This would include Pet Stores and Online purchases as well.
One of our "faults" in purchasing is, that we get in a rush, and want
the animal NOW ! One must suppress this, take his time in the search
for a vendor who will furnish an animal, which we can love and support
for years to come. Healthy animals are available !
Keep in mind how long they'll be with us...
Being careful and methodical about the choice, is worth it !
