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Inventories (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Inventory Disclosure [Abstract] |  |  |
Write-down of potentially obsolete or slow-moving inventories | $ 42,241 | $ 518,119 | $ 1,501,510
Lower of cost or market adjustment | $ 0 | $ 0 | $ 166,998

X
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X
- Definition Write-down of potentially obsolete or slow-moving inventories. + References No definition available. + Details
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Namespace Prefix: | petz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration