Here's a few suggestions for your list:
-Great Dane (huge, powerful but generally docile, fairly intelligent)
-Springer/Brittany Spaniel (two of the best gun dog breeds around, very intelligent, great appearance when groomed well)
-Golden/Chocolate Labrador (large, intelligent, strong, loyal)
-Border Collie (probably the smartest dogs around)
-Pug (just kidding)
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