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My Shih tzu / Rat terrier mix, Jackson, weighed between 12 & 13 lbs. In his prime. He had long legs like the Rat terrier. Broken coated hair grew much slower than Shih tzu. Best dog ever. I loved my little Jackson Boy!

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13y ago
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11y ago

it all depends on the genetics; the dog can pick up more genetics from one breed than the other. it is said that a rat-cha can get up to 3 times the size of a standard chihuahua; but it will also be smaller than a standard rat terrier which isn't very big. under 15lbs sounds about right. i have a rat-cha myself, and she is 3/4 chihuahua and 1/4 rat terrier. she weighs 5lbs as an adult but she has more chihuahua in her than rat terrier, so that will matter too.

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14y ago

I have two rat terriers. One is very small, 10 inches, the other is about 13. They're a very small breed, but very cute. They're great runners.

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15y ago

i think thay grow to 25 cm

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11y ago

18 inches

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10y ago

35 pounds

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Q: How big do mini rat terriers get?
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