As provided by savetstudent.tumblr.com:
This is a good infographic for once. Nice!
The major antigens are DEA 1.1 and DEA 1.2, and dogs can test positive only for one of these, or for none (ie they are negative for both).
German Shepherds have a predisposition for DEA 1.1 negative, and in that case they are also DEA 1.2 negative (see above).
This basically means, most GSDs can be considered universal blood donors, but they cannot safely be recipients of transfused blood from DEA 1.1 positive dogs, eg most Labradors and Golden Retrievers.
While a veterinarian will know your dog's blood type (test for it), I find it important that you have it recorded somewhere where time-pressured rescue workers can find it (like with your own blood type and that of your family members too).
So go here, download our unique Canine Vital Records Sheet and fill it in to be safe in emergency situations.
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