CHIHUAHUA WEIGHT CHART
The chihuahua weight chart is great to use as a guide to estimate a mature weight within a quarter of a pound or so. This table is used only as a guide as many things can affect the mature weight of a puppy. Weight may vary depending on it's bloodline, genetics, how well the animal is fed, etc. It may weigh more or less than it's ideal weight depending on it's diet and if it becomes obese or not. Weight estimates before the age of 8 weeks old are usually inaccurate because the puppy is still nursing or being weaned and may be heavier due to fat from the mother's rich milk. This chart does not apply to puppies that were born premature or orphaned and hand-raised.  This weight chart only works with purebred chihuahuas and a breeder that is knowledgeable about their bloodline (not just recognizing a bloodline's name, but recognizing the actual dogs as well).
 
 
 

Birth 
2 1/2 oz.  2 3/4 oz.  3     ozs  3 1/2 oz.  4 ozs 4 1/4 ozs 4 1/2 ozs 5      oz.  5 1/2 oz. 
 1 week  3 3/4     4    5  5 1/2  6 1/2     7     8     9  9 1/2
 2 weeks     5  5 1/2  6 1/2     7    9    10    11 12 1/2 13 1/2
 3 weeks     6     7     8     9    11    13    14    16 17 1/2
 4 weeks     7     8 9 1/2    11    13    15    17    19    21
 5 weeks     8     9    11    13    15    17 19 1/2    22    24
 6 weeks     9    11 12 1/2    15 17 1/2    20    22    24    27
 7 weeks    10    12 14 1/2    17 19 1/2    22 24 1/2    27    30
 8 weeks    11    13    16    19 21 1/2    24    27    29    33
 9 weeks    12    15 17 1/2    20    23    26    29    32    35
10 weeks    13    16    19    22    25    28    31    34    38
11 weeks    14    17    21    24    27    31    34    37    42
12 weeks    15    19    22    26    30    33    37    41    45
13 weeks    16    20    24    28    32    36    40    44    49
14 weeks    17    22    26    30    34     39    43    47    52
15 weeks    19    23    28    32    37    41    46    51    56
16 weeks    20    25    30    34    39    44    49    54    59
17 weeks    21    26    31    36    41    46    51    57    62
18 weeks    22    28    33    37    43    48    54    60    65
19 weeks    23    29    34    39    44    50    56    62    67
20 weeks    24    30    35    41     46    52    58    64    70
21 weeks    25    31    36    42    48    54    60    66    72
22 weeks    25    32    37    43    49    56    62    68    74
23 weeks    26    33    38    44    50    57    64    70    76
24 weeks    26    33    39    45    51    58    65    71    78
25 weeks    27    34    40    46    52    59    66    72    79
26 weeks    27    34    40    47    53    60    67    73    80
18Months  2 lbs 2 1/2 lbs   3lbs 3 1/2 lbs   4 lbs 4 1/2 lbs    5 lbs 5 1/2 lbs   6 lbs

This weight chart was excerpted from a book by an English lady by the name of Hilary Harmar. It has been passed around by breeders for so many years that it has become almost "generic", but we do want to give credit where it is due.