Puppy Weight worksheet

1. Estimated adult weight: 36.4 lb

1. Look up how much of its adult weight a large dog has: 25% at 12 weeks and 35% at 16 weeks. Then read between them for 13 weeks

   $0.25+\frac{13-12}{16-12}\times 0.35-0.25$$=0.275$

2. Today's weight is that share of the adult weight, so divide by the share to get the adult weight

   $\frac{10\text{\hspace{0.17em}lb}}{0.275}$$=36.363636\text{\hspace{0.17em}lb}$

3. Allow 15% either side, because individual puppies grow differently

   $36.36\times \text{(1 ± 0.15)}$$=\text{30.9 to 41.8 lb}$

2. Estimated adult weight: 58.1 lb

1. Look up how much of its adult weight a giant dog has: 12% at 8 weeks and 19% at 12 weeks. Then read between them for 10 weeks

   $0.12+\frac{10-8}{12-8}\times 0.19-0.12$$=0.155$

2. Today's weight is that share of the adult weight, so divide by the share to get the adult weight

   $\frac{9\text{\hspace{0.17em}lb}}{0.155}$$=58.064516\text{\hspace{0.17em}lb}$

3. Allow 15% either side, because individual puppies grow differently

   $58.06\times \text{(1 ± 0.15)}$$=\text{49.4 to 66.8 lb}$

3. Estimated adult weight: 20.5 lb

1. Look up how much of its adult weight a small dog has: 38% at 12 weeks and 50% at 16 weeks. Then read between them for 14 weeks

   $0.38+\frac{14-12}{16-12}\times 0.5-0.38$$=0.44$

2. Today's weight is that share of the adult weight, so divide by the share to get the adult weight

   $\frac{9\text{\hspace{0.17em}lb}}{0.44}$$=20.454545\text{\hspace{0.17em}lb}$

3. Allow 15% either side, because individual puppies grow differently

   $20.45\times \text{(1 ± 0.15)}$$=\text{17.4 to 23.5 lb}$

4. Estimated adult weight: 27.3 lb

1. Look up how much of its adult weight a small dog has: 38% at 12 weeks and 50% at 16 weeks. Then read between them for 14 weeks

   $0.38+\frac{14-12}{16-12}\times 0.5-0.38$$=0.44$

2. Today's weight is that share of the adult weight, so divide by the share to get the adult weight

   $\frac{12\text{\hspace{0.17em}lb}}{0.44}$$=27.272727\text{\hspace{0.17em}lb}$

3. Allow 15% either side, because individual puppies grow differently

   $27.27\times \text{(1 ± 0.15)}$$=\text{23.2 to 31.4 lb}$

5. Estimated adult weight: 25.9 lb

1. Look up how much of its adult weight a small dog has: 25% at 8 weeks and 38% at 12 weeks. Then read between them for 11 weeks

   $0.25+\frac{11-8}{12-8}\times 0.38-0.25$$=0.3475$

2. Today's weight is that share of the adult weight, so divide by the share to get the adult weight

   $\frac{9\text{\hspace{0.17em}lb}}{0.3475}$$=25.899281\text{\hspace{0.17em}lb}$

3. Allow 15% either side, because individual puppies grow differently

   $25.9\times \text{(1 ± 0.15)}$$=\text{22.0 to 29.8 lb}$

6. Estimated adult weight: 15.5 lb

1. Look up how much of its adult weight a toy dog has: 45% at 12 weeks and 58% at 16 weeks. Then read between them for 14 weeks

   $0.45+\frac{14-12}{16-12}\times 0.58-0.45$$=0.515$

2. Today's weight is that share of the adult weight, so divide by the share to get the adult weight

   $\frac{8\text{\hspace{0.17em}lb}}{0.515}$$=15.533981\text{\hspace{0.17em}lb}$

3. Allow 15% either side, because individual puppies grow differently

   $15.53\times \text{(1 ± 0.15)}$$=\text{13.2 to 17.9 lb}$

7. Estimated adult weight: 25.2 lb

1. Look up how much of its adult weight a small dog has: 50% at 16 weeks and 61% at 20 weeks. Then read between them for 18 weeks

   $0.5+\frac{18-16}{20-16}\times 0.61-0.5$$=0.555$

2. Today's weight is that share of the adult weight, so divide by the share to get the adult weight

   $\frac{14\text{\hspace{0.17em}lb}}{0.555}$$=25.225225\text{\hspace{0.17em}lb}$

3. Allow 15% either side, because individual puppies grow differently

   $25.23\times \text{(1 ± 0.15)}$$=\text{21.4 to 29.0 lb}$

8. Estimated adult weight: 24.9 lb

1. Look up how much of its adult weight a toy dog has: 45% at 12 weeks and 58% at 16 weeks. Then read between them for 13 weeks

   $0.45+\frac{13-12}{16-12}\times 0.58-0.45$$=0.4825$

2. Today's weight is that share of the adult weight, so divide by the share to get the adult weight

   $\frac{12\text{\hspace{0.17em}lb}}{0.4825}$$=24.870466\text{\hspace{0.17em}lb}$

3. Allow 15% either side, because individual puppies grow differently

   $24.87\times \text{(1 ± 0.15)}$$=\text{21.1 to 28.6 lb}$

9. Estimated adult weight: 65.5 lb

1. Look up how much of its adult weight a giant dog has: 12% at 8 weeks and 19% at 12 weeks. Then read between them for 9 weeks

   $0.12+\frac{9-8}{12-8}\times 0.19-0.12$$=0.1375$

2. Today's weight is that share of the adult weight, so divide by the share to get the adult weight

   $\frac{9\text{\hspace{0.17em}lb}}{0.1375}$$=65.454545\text{\hspace{0.17em}lb}$

3. Allow 15% either side, because individual puppies grow differently

   $65.45\times \text{(1 ± 0.15)}$$=\text{55.6 to 75.3 lb}$

10. Estimated adult weight: 44 lb

1. Look up how much of its adult weight a medium dog has: 20% at 8 weeks and 31% at 12 weeks. Then read between them for 9 weeks

   $0.2+\frac{9-8}{12-8}\times 0.31-0.2$$=0.2275$

2. Today's weight is that share of the adult weight, so divide by the share to get the adult weight

   $\frac{10\text{\hspace{0.17em}lb}}{0.2275}$$=43.956044\text{\hspace{0.17em}lb}$

3. Allow 15% either side, because individual puppies grow differently

   $43.96\times \text{(1 ± 0.15)}$$=\text{37.4 to 50.5 lb}$