Increase of Bitcoin and stable decrease in Alt Coin. Does it mean the Alt Coin is failing?

Well Dogecoin has been around for 10+ years and is certainly not going away anytime soon. there are so many altcoins out there. I think you got to zero in and study the tokenomics of the specific altcoin you are interested in

Like what @joey said- they are not mutually exclusive. But for now, to answer you- yes.

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Time to time it does look like btc is rallying while alts are bleeding, like recent times. As alts are further down the risk curve than btc, there's a few charts to help you ascertain the situation.

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BTC.D - bitcoin dominance. It broke out of a ~1yr accumulation range, looking strong against alts now.

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TOTAL2 & TOTAL3 - Total marketcap of crypto excluding btc (1) and total marketcap excluding btc & eth (2). Compare these to TOTAL to derive your thesis

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TOTAL3/BTC - Gives a clear picture where liquidity and capital is flowing to. Note that this excludes pocket of time where a few alts (outliers) can rally aggressively and outperform btc, because their mcap is so miniscule and insignificant, it does not reflect on this chart.

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Hope this helps.

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