Flickr/fazen
I was recently out of town for a few weeks, doing research for a book I'm writing, and when I returned she looked bigger. It was not my imagination. When we adopted her in December she was about six months old and weighed 30 to 35 pounds. Now she's closer to 40. Of course, many dogs don't stop growing until they are two years old.
As previously discussed, Pippi seems to be either a Dalmatian, German Shorthaired Pointer, or both (we're going to send away for the doggie DNA test soon). Her paws were (and are) too big for her body in that classic clumsy cute puppy way, but I've heard from numerous sources that it's not a good idea to guess a dog's full-grown size based on the size of her paws. (This can be deceptive.)
I've read that a good rule of thumb for small and medium-sized dogs is to take her weight at four months and double it. From talking with Pippi's foster dad, it's safe to assume she weighed about 25 pounds at four months. That would predict a full-grown size of 50 pounds, which would put her in the range of dogchannel.com's estimations; they say a full-grown Dalmatian can weigh between 40-65 pounds, and that a female German Shorthaired Pointer usually weighs 45-60 pounds as an adult.
Do these seem like good guesses? Have your rescue puppies ever turned out to be much bigger (or much smaller) than you expected?
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