The vet made 8 * 15 = $<<8*15=120>>120 in dog vet fees.

The vet made 3 * 13 = $<<3*13=39>>39 in cat vet fees.

The total vet fees were 120 + 39 = $<<120+39=159>>159.

The vet donated 1/3 of the fees, so they donated 159 / 3 = $<<159/3=53>>53 back to the shelter.

# Answer

53
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
An animal shelter is having a pet adoption event where owners can adopt an animal for just the cost of the vet fees. Vet fees for dogs are $15, and vet fees for cats are $13. Eight families adopt dogs and three adopt cats. The vet donates a third of the fees they were paid for the adoption checkups back to the shelter. How many dollars did the vet donate?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
53
An animal shelter is having a pet adoption event where owners can adopt an animal for just the cost of the vet fees. Vet fees for dogs are $15, and vet fees for cats are $13. Eight families adopt dogs and three adopt cats. The vet donates a third of the fees they were paid for the adoption checkups back to the shelter. How many dollars did the vet donate?
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