[Hattie and Rosie]

For my ESS x poodle puppy. Most places are recommending 30in x 18in but that seems too small? However she was the runt of the litter and is a small pup compared to her littermates. If I had to guess, I would say her mum (poodle) is about 16-17in at the withers. Dad is standard ESS dog size, about 20-22in
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[Dawnben]

Take the dog with you to petco or petsmart and ask.

 

[Sabina88]

Since she's a mix and can end up being any were in between the two breeds heights, I would go off the taller of the two breeds even if she ends up much shorter. I think the 30X18 might work, basicly you want a crate that they can comfortable stand in with out ducking their head.
As dawnben said the people at the petstore may be able to help you pick the right size crate.

 

[Hattie and Rosie]

Thank you!!

 

[traciek88]

However she was the runt of the litter and is a small pup compared to her littermates.

Runts can sometimes grow to normal size in adulthood so don't go by this.

I don't think the size difference between the two parents is that great, but I would just get a crate for a dog that was at least 20'' at the withers.